Questions Asked on
February 22, 2013

  1. chemistry

    a sample of glucose, c6h12o6 contains 2.03*10^21 atoms of carbon. (a)how many atoms of hydrogen does it contain? (b)how many molecules of glucose does it contain? (c)how many moles of glucose does it contain? (d)what is the mass of this sample in grams?

  2. Chemistry

    At 25 degrees celsius and 775 Torr, carbon dioxide has a solubility of 0.0347 M in water. What is the solubility at 25 degrees celsius and 1830 Torr

  3. physics

    Carl Lewis set a world record for the 100.0-m run with a time of 9.86 s. If after reaching the finish line, Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0m?

  4. Chemistry

    pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375 You wish to prepare 1.000L of a 0.0100M Phosphate buffer at pH7.55. To do this, you choose to use mix the two salt fomrs involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000L volumetric flask and add

  5. Physics urgent

    An archer shoots an arrow with a velocity of 45.0m/s at an angle of 50.0degrees with the horizontal.An assistant standing on the level ground 150m downrange from the launch point throws an apple straight up with the minimum intial speed necessary to meet

  6. Analytical Chemistry

    Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second

  7. Help please with reflection problem!?

    A laser is shot from vertex A of square ABCD of side length 1, towards point P on BC so that BP = 3/4. The laser reflects off the sides of the square, until it hits another vertex, at which point it stops. What is the length of the path the laser takes?

  8. Physics

    A test car travels in a straight line along the axis. The graph in the figure shows the car's position as a function of time

  9. calculus

    A circular swimming pool has a diameter of 14 m, the sides are 4 m high, and the depth of the water is 3.5 m. (The acceleration due to gravity is 9.8 and the density of water is 1000 .) How much work (in Joules) is required to: (a) pump all of the water

  10. chemistry

    the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?

  11. Math

    From 5 statisticians and 6 economists, a committee consisting of 3 statisticians and 2 economists is to be formed. How many different committees can be formed if: a. two particular statisticians must be in the committee? b. one particular economist cannot

  12. Physics

    A test tube in a centrifuge is pivoted so that it swings out horizontally as the machine builds up speed. If the bottom of the tube is 180.0 mm from the central spin axis, and if the machine hits 54000 rev/min, what would be the centripetal force exerted

  13. algebra

    Can someone check my answers please and if Im wrong please explain. 1) graph 4x^2+4y^2=64. what are the domain and range? domain;all real numbers range;-4

  14. Chem

    Calculate the mass percent composition of C,H, O and in aspirin. Express your answers using two significant figures. Enter your answers numerically separated by commas.

  15. Math

    In how many ways can a group of 10 people be divided into: a. two groups consisting of 7 and 3 people? b. three groups consisting of 4, 3, and 2 people?

  16. Physics urgent pls!

    A ball is tossed from an upper-storey window of a building.The ball is given an initial velocity of 8 m/s at an angle of 20 degrees below the horizontal.it strikes the ground 3s later .(a) How far horizontally from the base of the building does the ball

  17. Physics

    A 4.10 kg mass, m, on a frictionless table is moving in a circle with radius 0.390 m at a constant speed. m is attached to a 5.00 kg mass, M, by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest.

  18. trig

    What is the length of side c to the nearest whole number if side a 105 and angle A 65 degrees and angle B 37 degrees?

  19. math

    find the greatest common factor of these two expression 18 u^2 v^5 w^3 and 30 u^7 w^4

  20. Guidance and Discipline

    Which one of the following ideas will NOT help children to feel personal ownership in their classroom?

  21. science

    The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?

  22. Math

    Write a two digit odd number using 5 and 6

  23. Biology

    Which disorder causes a natural immunity to Malaria?

  24. physics

    A wooden crate weighs 780 lb. What force is needed to start the crate sliding on a wooden floor when the coefficient of starting friction is 0.40?

  25. Algebra II

    A line has a slope of 2 and contains the points (1, 3) and (2, y). The value of y is what? Please explain in detail

  26. Chemistry

    A helium balloon contains 0.54g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?

  27. Chem

    Calculate the mass percent composition of C,H, O and in aspirin. Express your answers using two significant figures. Enter your answers numerically separated by commas.

  28. english 4 AP

    I have an essay due and I cannot really understand the topic im supposed to write about. Its about the novel "sense and sensibility" Many plays and novels that focus upon the courtship or marriage of a man and a woman include a second pair who help to

  29. literacy

    The broadest type of search, which looks for your terms any where , is a/an . A. title B. keyword C. auther D. subject my answer c

  30. math

    Kevin plotted a linear equation on a graph with 18 as the y-intercept. Which of the following could be the equation plotted by Kevin?

  31. algebra

    A few more question Id like for someone to check please. 1) what are the vertex, focus, and directrix of the parabola with the given equation? x^2-8x-28y-124=0 vertex (4,-5) focus (0,7) directrix y=-12 2) write an equation of a circle with given center and

  32. science

    A force of 20 N gives an object an acceleration of 5m/s^2. (a) What force would be needed to give the same object an acceleration of 1m/s^2? (b) What force be needed to give it an acceleration of 10m/s^2?

  33. Guidance and Discipline

    Which one of the following ideas will NOT help children to feel personal ownership in their classroom?

  34. Analytical Chemistry

    Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) CO2(aq) The acid dissociation constants listed in most standard reference texts for carbonic acid actually

  35. chemistry

    A sample of liquid consisting of only C,H and O and having a mass of 0.5438g was burned in pure oxygen and 1.039g of CO2 and 0.6369g H2O were obtained. what is the empirical formula of the compound?

  36. Rioja

    A normally distributed population with 200 elements has a mean of 60 and a standard deviation of 10. The probability that the mean of a sample of 25 elements taken from this population will be smaller than 56 is:

  37. science

    The mean weight of 500 male students at a certain college is 151 pounds (lb), and the standard deviation is 15 lb. Assuming that the weights are normally distributed, find the probability of students weight (a) between 121 and 155 lb (b) more than 185 lb.

  38. Physics

    A girl whirls a stone in a horizontal circle 1.9 m above the ground by means of a string 111 cm long. The string breaks, and the stone flies of horizontally and strike the ground 11.2 m away. What is the centripetal acceleration of the stone while in

  39. Please help on geometry - analytic geometry

    What is the area, in square units, of a triangle whose vertices are at (4,-1), (10,3) and (4,5) ? How to do this?

  40. Biology

    What results in the combination of the haploid sets of chromosomes from two individuals into a diploid zygote

  41. calc

    The price in dollars of a house during a period of mild inflation is described by the formula P(t)=94000 e0.03 t, where t is the number of years after 1990. Answer the following questions: B. In the year 2000 the value will be increasing at a rate of

  42. Helpppp

    Find the apr to the nearest half percent for the following loan Amount financed $3400 Finance charge $470 Number of monthly payments 36 Please help

  43. math

    Melissa and her friends are stretching rubber bands for an activity in class. Melissa stretched her elastic to 10 inches. Juan stretched it 3 1/2 times as far. Sara stretched it 4/4 as far. Marsha stretched it 2/5 as far. Put the students in order of how

  44. math

    The price in dollars of a house during a period of mild inflation is described by the formula P(t)=94000 e0.03 t, where t is the number of years after 1990. Answer the following questions: B. In the year 2000 the value will be increasing at a rate of

  45. Math 0098

    Last year, Deon had $20,000 to invest. He invested some of it in an account that paid 6% simple interest per year, and he invested the rest in an account that paid 10% simple interest per year. After one year, he received a total of $1880 in interest. How

  46. algebra 1

    1/a-y=1/y solve for "y"

  47. English

    Can someone help me with these questions please. Bret Harte "Plain Language from Truthful James" 1. What was the major theme in this poem? 2. What can we learn from the characters in the poem about the people of this time period. 3. What lesson can be

  48. Life Skills

    The Civil War was an example of which type of conflict? a. interpersonal b. intrapersonal c. intergroup d. intragroup I believe its C, is that correct?

  49. help asap!!

    Bernie put in a garden in her back yard. The garden has a perimeter of 213 feet. She wants to know the total surface area of the garden and all she knows is the perimeter and that the width is 20% or (1/5) of the length. (Remember 20% and the fraction 1/5

  50. statistics

    otorola discovered that the average defect rate for parts produced on an assembly line varies from run-to-run and is approximately normally distributed with a mean equal to 3 defects per million. Assume that the goal at Motorola is for the average defect

  51. Calculus

    Question 1. A stuntman falls from a hot air balloon that is hovering at a constant altitude,100 feet above a lake. A television camera on shore, 200 feet from a point directly below the balloon,follows his descent. At what rate is the angle of elevation,

  52. science

    In seed plants, what is an important difference between gymnosperms and most angiosperms? A)Gymnosperms rely on animals to carry pollen from the female gametophyte to the male gametophyte, while angiosperms rely on wind. B)Gymnosperms require water for

  53. mechanics of materials

    4. A metal bar with a cross-sectional area of 50mm2 is subjected to a tensile strain of 0.001. What is the tensile force responsible for the strain given that the material has a Young's modulus of 15GNm raise to the power -2 A 0.003N B 7.5x10 3N C 7.5x 10

  54. APA

    I am writing a report in apa and I was not sure if it is okay to ask a rhetorical question in the introduction?

  55. Nsuk

    (1)calculate the heat energy datas temperatures 100degree celciuse and 4degree celciuse,mass 0.5kg take latent heat of vapourisation 2.02times10raised to the power of minus6.(2)calculate the specific latent heat of fusion mass of calorimeter 0.01kg and

  56. mechanics of materials

    a mild steel bar of length 10cm and width of 10mm is extended by 0.01 mm. Which of the following is equal to the change in width of the bar.(The Poisson's ratio of mild steel is 0.31) A 3.1x10-4mm B -3.1x10-4mm C 3.1x10-5mm D -3.1x10-5mm

  57. Physics

    Two electrons are separated by 1 meter. What is the ratio of the magnitude of the electric force on one electron and the gravitational force on that electron due to the other electron? The charge of an electron is 1.6×10−19C and its mass is

  58. Physics

    Three charges (q1=1 μC, q2=−2 μC, q3=3 μC) are located at the corners of an equilateral triangle with sides of length one meter. The 3 μC charge is: Repelled by q1 and attracted by q2. Attracted by q1 and repelled by q2. Attracted by both q1 and q2.

  59. Geometry - please help - reflections

    A laser is shot from vertex A of square ABCD of side length 1, towards point P on BC so that BP = 3/4. The laser reflects off the sides of the square, until it hits another vertex, at which point it stops. What is the length of the path the laser takes?

  60. Math

    Out of 4 architects, 6 engineers and 9 electricians, how many ways can a group of 6 people be formed to attend a forum if: a. there is an equal number of architects, engineers and electricians b. two particular engineers cannot be in the committee? c.

  61. Math

    In the sequence below, each shaded triangle, after the first is 1/4 the area of the preceding shaded triangle. What is the ratio for the shaded area of the 5th triangle?

  62. math

    A grocer sell 84 oranges in one day. At the end of the day, the grocer has 1/3 as many oranges as he did at the start of the day. If n=the number of oranges the grocer has left at the end of the day, which of the equations could be used to determine the

  63. Math

    f=8ln(sec(x)+tan(x)) f'=

  64. Math

    I need help on the worksheet of what do you get if a bunch of bad guys fall into the ocean worksheet. I don't want the answer I want help on the problems.

  65. Math

    I need help on the worksheet of what do you get if a bunch of bad guys fall into the ocean worksheet. I don't want the answer I want help on the problems.

  66. physics 203

    a projectile is thrown with initial speed v0=25.0m/2 at an initial angle with the horizontal ANGLE=45 degrees. a. find the time when the projectile is at the maximum height. b. find the position(x,y) at the maximum height. c. at time T, find the components

  67. NUTRTION AND GENERAL HEALTH

    Which one of the following vegetables provides four important nutrients—vitamin A, vitamin C, folic acid, potassium—and dietary fiber? A.Sweet potatoes B.Carrots C.Spinach

  68. math

    if a person can fill a tank in 12 min. and another person can fill a tank in 20 min. How long will it take both of them to fill 1 tank together?

  69. Algebra 1

    The first of three pipes fills a tank in 12 minutes and a second pipe in 10 minutes. If both these pipes and also a third pipe are open the tank is filled in 4 min. How many minutes will the third pipe alone require to fill the tank? My teacher told me to

  70. math

    find two consecutive natural number the sum of whose reciprocal is 11/30

  71. Mathematics

    what geometric figure/shape can we find in enchanted kingdom, rizal shrine in laguna, and in gardenia factory?????? i really need it plz help me T.T

  72. health

    A client comes in and asks for a pregnancy test. What do you do?

  73. Calculus

    H(x) = (x^4 - 2x +7)(x^-3 + 2x^-4) H'(x)=

  74. Algebra 1

    3(n)-2(2n+2)=1/3(n+4) help please, show your work. thank you!

  75. Math 0098

    Last year, Joe had to invest. He invested some of it in an account that paid simple interest per year, and he invested the rest in an account that paid simple interest per year. After one year, he received a total of in interest. How much did he invest in

  76. math

    several freshmen tried out for the school track team. after round 1, 1/2 of the freshmen were eliminated. After round 2, 1/3 of those remaining were eliminated. After round 3, 1/4 of those remaining were eliminated. After round 4, 1/5 of those remaining

  77. Calculus

    Find the derivative of f(x) = ln(13e^(5x) + 2)

  78. non permissable values

    i have a hard time understanding the non permissable values could someone please explain. I have solved the following equations but need help determining the values. Also if you could check to see if i did them right it would be alot of help 1.

  79. Math

    Solve for x 5/x-2 + 2/x+5 = 4/x^2+3x-10 not sure i know how to do this

  80. physics

    A container holds 1.3 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 6.7x10-3 kg bullet with a speed of 830 m/s. What is the Kelvin temperature of the gas?

  81. trig sub question

    Hello, I have a question concerning trigonometric substitution. let's say we have integral of dx/sqrt(9x^2 + 4), so after doing a few steps we have: 2/3 integral of sec0/sqrt((2tan0)^2 + 4*) d0 (the * is for later on) the next step turns into: 2/3 integral

  82. Physics

    Find the mass of water that vaporizes when 3.94 kg of mercury at 248 °C is added to 0.183 kg of water at 83.0 °C.

  83. math

    f=(x)cosh^(-1)((x)/(2))-√((x)^(2)-4) f'=

  84. math

    if one of the zeros of y=x^2+bx+1 is 1 determine the value of b anyone understand this and can help me break it down

  85. Calculus

    F(x) = x^2 sin x F'(x) y= tan x/x^2 y'=

  86. Algebra 1

    The first of three pipes fills a tank in 12 minutes and a second pipe in 10 minutes.If both these pipes and also a third pipe are open, the tank is filled in 4 minutes. How many minute will the third pipe alone require to fill the tank? Just need an

  87. Math -algerbra

    can someone show me how to solve an equation algerbracially x=sqrtx+10+2

  88. Math -algerbra

    can someone show me how to solve an equation algerbracially x=sqrtx+10+2

  89. math

    I have to put these in order from greatest to least without multiplying? 6x 2/5, 3 2/3x 2/5, 2/7x2/5, 2/2x2/5 I think this is correct the way it is am I right?

  90. Math

    Yusuf can run once around a 400-meter track in 48 seconds. If he could maintain that pace, how many meters would he run in 192 seconds? Write an equation you would use for solving this problem.

  91. math

    factor the following expression 15 u v w^8+30 u^5 w^9 and factor 36 x^2-y^2 and 7u+7v+v w +wu

  92. calculus

    y = (sin x) / (1 + tan x)

  93. Math

    f(x)=x^5x Use logarithmic differentiation to determine the derivative.

  94. Algebra1

    I have to solve for "x": bx/c=2-cx/b please show your work! Thank you!

  95. Physics

    True or False. When non-conservative forces are present, the amount of work done increases with the length of the path.

  96. history

    Who came to power in China, instituting a Communist regime that would bring great suffering to the nation's people

  97. Biology

    What results in the combination of the haploid sets of chromosomes from two individuals into a diploid zygote

  98. chemistry

    Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 11.1 g of biphenyl in 29.1 g of benzene?

  99. Science

    Proteins found on the outside of cells and viruses are called ____________ , these are used by the body to _______________ pathogens. antigens; help antibodies; make antigens; identify antibodies; reproduce Identify the response below that summarizes the

  100. statistics

    What is the standard deviation of 31 sample values with a mean of 2954?

  101. math

    round up 114.29 to nearest cent

  102. Marine science

    A cylindrical container is 30cm in diameter. If is filled at rest by 20 cm of fresh water, and then spun at 30 rpm. after state of solid body rotation is achieved, what is the difference in level between the rim and the center

  103. maths

    A sum of Rs100 is invested at 8%. Simple interest per annum. Calculate the interest at the end 1,2,3.....years.

  104. trig

    (sec^2x-1)(csc^2x-1)=1 prove the following identity ive been stuck on this for hours please help

  105. math

    the length of a rectangle is 3 yds more than twice it width and the area of the rectangle is 77yds find the dimensions of the rectangle the length and width

  106. maths

    A sum of Rs100 is invested at 8%. Simple interest per annum. Calculate the interest at the end 1,2,3.....years.

  107. Guidance and Discipline

    Which one of the following ideas will NOT help children to feel personal owernership in their classroom?

  108. Math

    how would i write out this equation into a simplified experssion using exponents. (81a^8b^4)^1/4

  109. HISTORY

    HABSBURG VS OTTOMAN

  110. Physics

    In a series RCL circuit the generator is set to a frequency that is not the resonant frequency. This nonresonant frequency is such that the ratio of the inductive reactance to the capacitive reactance of the circuit is observed to be 4.91. The resonant

  111. PHYSICS 2

    The antenna broadcasts radio signals at the resonant frequency of the tank circuit. Suppose that a certain tank circuit in a shortwave radio transmitter has a fixed capacitance of 1.8 x 10-11 F and a variable inductance. If the antenna is intended to

  112. Physics

    During a circus performance, a 77-kg human cannonball is shot out of an 20-m-long cannon. If the human cannonball spends 0.91 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

  113. Trigonometry

    An observer on a cliff 1000 dm above sea level sights two ships due east. the angles of depression of the ships are 44o and 32o. Find the distance between the ships.

  114. Math

    From 5 statisticians and 6 economists, a committee consisting of 3 statisticians and 2 economists is to be formed. How many different committees can be formed if: a. two particular statisticians must be in the committee? b. one particular economist cannot

  115. Math f(x)

    given f(x)= x^2+x and g(x)=2x+1 determine f[g(x)] i don't even know where to start with this question help is much needed

  116. calculus

    use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point. x2y2 − 1= 0;(0.5, 2)

  117. graphing

    im not sure how to do this question A student fires a model rocket into the air. The rocket reaches a maximum hieght of 24.8 meters and lands 55 meters from the student. (assume parabola and no wind) a. list three points of trajectory(coordinate pairs) b.

  118. calculus

    use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point 2xy2 – y = 10; (1, −2)

  119. math

    In a certain high school class, consisting of 60 girls and 40 boys, it is observed that 24 girls and 16 boys wear eye glasses, if a student is picked at random from this class. What is the probability that student picked at random is a boy, what is the

  120. Biology

    Please Help Quick,Write Out The Balanced Chemical Equation For Respiration In An Athlete In A Race.

  121. Math

    y=(4(x)-3)^(2)*(3(x)^(2)+2)^(4) implicated differentiation

  122. website

    What is the website that is used to do the diagrams. Its like circles connected to circles in this diagram.

  123. calculus

    use implicit differentiation to find dy/dx . Then evaluate the derivative function at the designated point. log (xy)= 2; (4, 25)

  124. college algebra 1111

    solve. 2z^2-7=-48

  125. chemistry

    how many grams of CO2 can be formed by the complete combustion of a 14.7 sample of C2H6 that is 92.4% pure?( assume the impurities contain no carbon)

  126. Math

    The sum of twice a number and another number is 24. The difference of twice the first number and the other number is 12. Which system would model this situation, and what is the solution?

  127. Algebra

    I am confused on how solve this substitution problem 4y+3=3y+x 2x+4y=18 If you can, show work please (:

  128. comm156

    Create an outline that includes details that support your thesis. Outline only the body of your paper. Remember to avoid bias to strengthen your writing (that is, present a balanced case for your thesis). Explain in a short paragraph why you decided to

  129. English

    I am having trouble writing my thesis statement on the power of destiny in romeo and juliet. Any suggestions

  130. Math

    find f' of f=(x)cosh^(-1)((x)/(2))-√((x)^(2)-4)

  131. math

    several freshmen tried out for the school track team. after round 1, 1/2 of the freshmen were eliminated. After round 2, 1/3 of those remaining were eliminated. After round 3, 1/4 of those remaining were eliminated. After round 4, 1/5 of those remaining

  132. geometry

    abcd is a parallelogram with sides ab=12 cm,bc=10 cm and diagonal ac=16 cm .find the area of the parallelogram also find the distance between its shortest sides

  133. statistics

    For a population of μ = 70 and σ = 20, find the z-score and percentile rank for each of the following X scores: 80, 100, 65, 40.

  134. edu

    Ms. Rook chose to develop her theme of life cycles around The Very Hungry Caterpillar by Eric Carle. She is using a.a thematic inquiry approach b.webbing c.a thematic/literature based approach d.a whole language learning Not sure between b and c i think c

  135. Algebra 2 ..

    Simplify. 1. Log base 4 of 256^2 IS THE ANSWER 8....IF SO AM I SMART? 2. Log of 45 ^x Is the answer 1.65X? 3. Log base 6 of 12 ^(x+1) Is the answer 1.39x+1.39?

  136. english

    Is arranging and changing places an example of assonance?

  137. Physics

    Posted by Dan on Thursday, February 21, 2013 at 11:17pm. Plane flying southwest at 155mi/hr. their is a wind from the west at 45.0mi/hr. what's the planes new velocity

  138. College math

    Can someone please assist me The problem reads "use the rule of 78 to find the payoff amount for the loan paid in full before the date" Finance charge: $717 Total number of payments 41 Amount per payment $155 Remaining payments when paid in full 10 Please

  139. math help!!

    A boat travels down the river in 2.9 hours. The return trip up river takes 3.6 hours. A one way trip down or up river is a distance of 30 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need

  140. math

    Kevin plotted a linear equation on a graph with 18 as the y-intercept. Which of the following could be the equation plotted by Kevin?

  141. math

    Kevin plotted a linear equation on a graph with 18 as the y-intercept. Which of the following could be the equation plotted by Kevin?

  142. Biology

    1) What memory system is sensation responsible for? Sensory, short term or long term memory system? Explain. 2) How does encoding memories relate to transfer appropriate processing and fluid intelligence?

  143. information literacy

    what is the best way to incorporate an idea from a journal article into a research paper

  144. math

    9 men build a house in a working 4 days .how many workmen ,working at the same rate willbe needed to build a house in 3 days

  145. Chem

    The total pressure in a vessel containing hydrogen collected over water at 25.0°C was 0.8 atm. The vapor pressure of water at that temperature is 23.8. what was he pressure of the oxygen in torr?

  146. chemistry

    0.50g of a mixture of K2c03 and Li2c03 requires 30ml of a 0.25N hcl solution for neutralization. What is the percentage composition of the mixture? The answer k2c03 96% Li2c03 4% K2c03 weight 138g/mol 138/2 = 69 Li2c03 weight 74g/mol 74/2 = 37 30ml x 0.25N

  147. chemistry

    the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?

  148. Physics

    A plane is flying at 25 degrees north of west at 190km/ h. Suddenly there is a wind from 15degrees north of east at 45 km/ hr. what is the planes new velocity with respect to ground in standard position

  149. physics

    A 50 V battery has an internal resistance r. 1 A 50 V r 55 Ω 66 Ω internal resistance What is the value of r? Answer in units of Ω

  150. physics

    a particle of mass(m) attack to a string of length (r) b wave round in a circle with speep(b) fine the form of the expression for the tension the string

  151. Math

    f=8arctan(6x) f'=

  152. Physics

    A particle of mass 6.80 10-8 kg and charge 4.4-µC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 29.0 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west.

  153. PHYSICS

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  154. Math

    F=tan^(-1)(cos(2x)) F'=

  155. physics HELP!

    A container holds 1.3 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 6.7x10-3 kg bullet with a speed of 830 m/s. What is the Kelvin temperature of the gas?

  156. Physics

    You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around

  157. Patho - Hyperkalemia and Heart Attacks

    Could someone please explain why an increase in potassium would cause a decrease in HR? I need someone to really dumb it down for me so I can fully understand. i was thinking that more Ka+ would increase the HR but in my lesson, it said it would slow down

  158. Dynamics

    It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output

  159. English

    What is a rebuttal counterargument?

  160. Science

    If the competing equilibria are ignored, does that mean the value of their equilibrium constant cant be calculated?

  161. math

    sam, pam, ken, and jen wrote each of their names on a slip of paper and placed them in a bowl.Sam was the first to randomly select a name from the bowl. What is the probability that he will select his own name? express answer as a fraction and a

  162. chem

    if a sample of iron(III) oxide contains 22.56g of iron, what is the mass of the sample? do u just find the molar masses?

  163. physics

    The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a

  164. physics

    An aircraft in a straight line with a constant speed of 450km.h ,What is the magnitude of the resultant force acting on the aircraft?

  165. english

    please make corrections if any. John contacted juli and asked whether she received book which he sent through George. Juli said George hasn't given the book. John said George is telling all the persons in a defaming manner that he is distributing the waste

  166. world geography

    1. The natural vegetation regions of sub-Saharan Africa A. are heavily impacted by human activity. B. don't correspond closely to climatic regions. C. only correspond to climatic conditions in areas of West Africa. D. are all characteristic of equatorial

  167. Engineering Maths

    please help solve this differential equation: x^3+(y+1)^2 dy/dx=0

  168. Engineering Maths

    Pleas help solve the ffg. differential equation: dy/dx-(1+1/x)y=y^2

  169. Engineering Maths

    help solving the ffg. differential equation: dy/dx +ytanx=y^3sec^4x

  170. math

    A jar had 16 marbles 4 are red . One marble is drawn and not replaced. Then s second marble is drawn . What is the probability of selecting a red marble and then another red marble?

  171. math

    Five (5) years ago, you bought a house for $171,000, with a down payment of $30,000, which meant you took out a loan for $141,000. Your interest rate was 5.75% fixed. You would like to pay more on your loan. You check your bank statement and find the

  172. math

    A jar had 16 marbles 4 are red . One marble is drawn and not replaced. Then s second marble is drawn . What is the probability of selecting a red marble and then another red marble?

  173. Organic Chemistry

    NMR: What can be said about proton spin decoupling? a) It depends on the number of attached protons. b) It slows the deshielding effects of π -electron circulation. c) It is the same as Distortionless Enhancement with Polarization Transfer. d) It is an

  174. physics

    Tony (of mass 75 kg) coasts on his bicycle (of mass 15 kg) at a constant speed of 4 m/s,carrying a 14 kg pack. Tony throws his pack forward, in the direction of his motion, at 6 m/s relative to the speed of bicycle just before the throw.What is the initial

  175. algebra

    Five (5) years ago, you bought a house for $171,000, with a down payment of $30,000, which meant you took out a loan for $141,000. Your interest rate was 5.75% fixed. You would like to pay more on your loan. You check your bank statement and find the

  176. mechanics of materials

    An aluminium alloy bar with a Young's modulus of 70GPa is under a tensile stress of 10MPa, Which of thefollowing is the equal to the strain in the bar? A 0.0014 B 7.0x10 3 c 700 D 1.4x10 -4

  177. mechanics of materials

    An aluminium alloy bar with a Young's modulus of 70GPa is under a tensile stress of 10MPa, Which of thefollowing is the equal to the strain in the bar? A 0.0014 B 7.0x10 3 c 700 D 1.4x10 -4

  178. mechanics of materials

    The change in length of a steel wire under an applied load can be halved by keeping all other conditions constant but using:which of the following is correct A. a different material having a Young's modulus half that of steel B half the cross sectional

  179. math

    a rectangle is 6in wide and 14in tall if it is reduced to a width of 3in then how tall will it be

  180. Calculus

    Find the integral of x times the square root of (400-100x^2)dx

  181. Chemistry

    Heyy Jiskha!! I need ur help today:) Hope you will help:D My question is that why is supersaturation unstable... I read the explanations for this on many websites but for some odd reason I just cannot get it to sink in my mind. What does it mean by it is

  182. Calculus

    Find the integral of x^2 divided by the square root of (2x-x^2) dx

  183. English

    Bret Harte "Plain Language from Truthful James" 1. What was the major theme in this poem? 2. What can we learn from the characters in the poem about the people of this time period. 3. What lesson can be learned from the plot if this poem. 4. What message

  184. Math question?

    Calculate the length of the diagonal for the given rectangular prism. It says length hight width but in the lesson it says length hight deph how to i find the diagonal example

  185. CHEMISTRY

    WHAT IS THE MEANING OF THE NUMERICAL REPRESENTED BY X IN THE GENERAL FORMULA FOR HYDRATE; SALT H2O?

  186. science

    3. In a sample of 64 students given an examination in statistics, it is found that the mean weight is 57 kg with standard deviation 9 kg. Find : Ć i) The proportion of students weight 48-62 kg. Ć ii) The proportion of those less than 72 kg. Ć iii)

  187. Physics

    A car is traveling at 44.4 km/hr on flat highway. If the coefficient of friction between road and tires on a rainy day is 0.114, what is the minimum distance in which the car will stop?

  188. Math

    24 m of fencing are available to enclose a play area. what would the maximum area be if the fencing only went on 3 sides because the wall is used as the 4th side. Please show you work

  189. science

    A toyota engine has an efficiency of 45% and produces 3010J of work. How much heat does the engine reject?

  190. maths

    How many ordered sets of non-negative integers (a,b,c,d) are there such that a+b+c+d=10?

  191. social studies !

    Hi, what are some servants, shopkeepers, or slaves in Ancient Rome?

  192. chemistry

    use the following data to calculate the mean bond enthalpy values for the C-H and C-C bonds. CH4(g)-C(g) + 4H(g) standard enthalpy change is +1648 kj/mol C2H6(g)-2C(g) + 6H(g) standard enthalpy change is +2820 kj/mol

  193. mechanics of materials

    A mild steel bar of width 10mm is subjected to a tensile stress of 3,0x105 Pa. Given that Young’s modulus for mild steel is 200 GPa and Poisson’s ration for mild steel is 0.31, calculate the change in width of the bar. Is the width increased or

  194. Math

    2+5+8+11+14+17+20+...........=?

  195. Math

    If you have one $50 bill, one $20 bill, one $10 bill and one $100 bill, how many possible sums of money consisting of three bills each, can be formed?

  196. Math ASAP

    Bonnie has a rectangular photographic print that is 5 inches wide and 7 inches long. If she multiplies both the length and width by 1.5, how will the perimeter of the print increase?

  197. edu

    Which one of the following would NOT be a typical communication for a three year old ? a."Thats Scary b."I'm hungry c."Nobody likes carrots d.I wan cookies I think c not sure though

  198. physics

    A girl whirls a stone in a horizontal circle 1.5 m above the ground by means of a string 141 cm long. The string breaks, and the stone flies of horizontally and strike the ground 13.6 m away. What is the centripetal acceleration of the stone while in

  199. social studies !

    Hi, i'm the person that asked what are some servants, shopkeepers, or slave in Ancient Rome. What I mean is what are the names of someone that is either a shopkeeper, servant, or slave. That google type of site did not help ! Can you people please help me

  200. Social Studies

    Ms. Sue, you are so awesome! I know this is not a question, but if you're reading this, I would like to thank you for all the help you have given. You are a wonderful teacher :)

  201. Algebra 1

    Find three consecutive even numbers such that the difference between 3 times the first number and twice the second number is 1/3 the third number. also, my teacher told me to use an equation.

  202. Calculus

    y= (t^3 + t)/(t^4 - 2) y'=