Questions Asked on
November 19, 2010

  1. chemistry

    Nitrosyl bromide decomposes according to the following equation. 2NOBr (g)(equilibrium arrow) 2NO (g) + Br2 (g) A sample of NOBr (0.64 mol) was placed in a 1.00-L flask containing no NO or Br2. At equilibrium the flask contained 0.46 mol of NOBr. How many

    asked by jessie
  2. AP Chemistry

    What is the structure for PCl3Br2 and 3 isomers?

    asked by devin
  3. college chemistry

    What is the entropy change for the vaporization of 2.6 mol H2O(§¤) at 100◦C and 1 atm? dH= 40700 J/mol Answer in units of J/K

    asked by Samantha
  4. College Chemistry

    Write a complete set of quantum numbers for the 5th electron added to H ion..(5th electron in any electron configuration). n= l= m(l)= m(s)=

    asked by Anonymous
  5. Chemistry

    What volume of a 0.176 M Na2S solution contains 1.01 g of Na+ ions? Please show work, I appreciate your help

    asked by MARIE
  6. Math HELP

    The table below shows the measured dimensions of a prism, and the maximum and minimum possible values based on the greatest possible error. Dimensions l w h Measured 9 5 3 Maximum 9.5 5.5 3.5 Minimum 8.5 4.5 2.5 a. Find the measured volume. b. Find the

    asked by Stephen
  7. Chemistry

    Manufacturing of Freon (CCl2F2): 2 HF(g) + CCl4(I) --> CCl2F2(g) + 2 HCl(g) Supplies on hand: 1.0kg HF and 1.0 kg CCl4. After the reaction was conducted, 0.44kg CCl2F2 was measured in the lab. 1) What is the theoretical yield of Freon? 2) What was the

    asked by Kathy
  8. College Chemistry

    Calculate the vapor pressure of a solution of 0.39 mol of cholesterol in 5.4 mol of toluene at 32oC. Pure toluene has a vapor pressure of 41 torr at 32oC.

    asked by Molly
  9. Physics

    A rope can withstand a maximum tension of 75 N before snapping . What maximum speed can you spin a 6.0 kg rock in a vertical circle of radius 1.5 m without breaking the rope? My answer: At the bottom of the spin: Fnet=ma Ft-Fg=m(v^2/r) 75-58.8=6(v^2/1.5)

    asked by Dwight
  10. Physics

    What minimum coefficient of friction between the tires and the road will allow a 3700 kg truck to navigate an unbanked curve of radius 25 m at a speed of 45 km/h? My answer: Fnet=ma Ff=m(v2)/r) Ff=(3700)(452/25) Ff=(3700)(2025/25) Ff=(3700)(81) Ff=299700

    asked by Ed
  11. math and music

    How would you go about listing all of the integer ratios? I would like to have the integers listed in ascending order by the product of each integer's numerator and the denominator. This is because in music, more "complex" ratios sound more dissonant.

    asked by Gray
  12. chemistry

    If you mix 20.0 mL of a 3.00 M sugar solution with 30.0 mL of a 5.57 M sugar solution, you will end up with a sugar solution of_______.

    asked by Angela
  13. calculus

    Evaluate the integral by interpreting it in terms of areas. int_(0)^(9) (7/2x - 21)dx can someone please help me with this question i keep on getting the wrong answer...the answer i got was -324/4

    asked by eddy
  14. s.s

    1. Write an essay that compares and contrasts the ways in which China and Japan responded to the West and describes how each nation’s decision to respond to the West affected its domestic and foreign affairs in the years that followed.

    asked by danya
  15. chemistry

    in a titration, 0.0400 mol of solid NaOH is required to neutralize 10.0 mL of H2SO4(aq). From these data, the [H2SO4] is:

    asked by jj reddick
  16. science-biology

    In lab, you use a special balloon that is permeable to water but not sucrose to make an "artificial cell". The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water.

    asked by Tracee
  17. geometry

    find the meausre of each exterior angle for a regular nonagon

    asked by amanda
  18. Biology

    If a diploid organism has 4 chromosomes, how many pairs of homologous chromosomes would you expect to see during early prophase I?

    asked by bella
  19. College Chemistry

    A sample of octane in equilibrium with its vapor in a closed 1.0 L container has a vapor pressure of 50 torr at 45oC. The container’s volume is increased to 2.0 L at constant temperature and equilibrium is re-established. What is the vapor pressure? The

    asked by Mollie
  20. physics help

    The earth orbits the sun once a year (3.16 10^7 s) in a nearly circular orbit radius 1.50 10^11 m. With respect to the sun, determine the following. (a) the angular speed of the earth 1 rad/s (b) the tangential speed of the earth 2 m/s (c) the magnitude

    asked by john
  21. chemistry

    Iron metal CANT reduce Fe3+ to Fe2+. Why?

    asked by Jenny
  22. acid and base titrations

    in a titration, 0.0400 mol of solid NaOH is required to neutralize 10.0 mL of H2SO4(aq). From these data, the [H2SO4] is:

    asked by jj reddick
  23. chem, help please

    A 0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. The velocity of the rock is 4.50 m/s. What is the centripetal force acting on the rock? how do i find centripetal force??

    asked by Jon
  24. physics

    The earth orbits the sun once a year (3.16 107 s) in a nearly circular orbit radius 1.50 1011 m. With respect to the sun, determine the following. (a) the angular speed of the earth (b) the tangential speed of the earth (c) the magnitude and direction of

    asked by john
  25. Physics

    A spring with spring constant 14.0 N/m hangs from the ceiling. A 490 g ball is attached to the spring and allowed to come to rest. It is then pulled down 8.00 cm and released. What is the time constant if the ball's amplitude has decreased to 2.90 cm after

    asked by Michael
  26. Chemistry

    Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

    asked by Roger
  27. physics

    A room is 3.4 smoots wide, 7.1 smoots long, and 1.5 smoots high. 28% of the room's walls are windows and doors. Determine the inside wall surface area of a 1/20 scale model of the room. (sq. in)

    asked by sandhu
  28. Chemistry

    What volume of NaOH is required to neutralize 50mL of 0.5M phenol? So this is just a small calculation in a complex problem, and I would just like someone to check my work so I don't mess up the entire problem based on this calculation. So mol phenol=

    asked by Jon
  29. college

    18.0 grams of oxygen is reacted with nitrogen to make 56.0 grams of nitrogen dioxide according to the following reaction: 2O2 + N2 ---> 2 NO2 How much nitrogen (in grams) reacted?

    asked by SAMM
  30. Math

    The 10th term of an arithmetic series is 34, and the sum of the first 20 terms is 710. Determine the 25th term.

    asked by Emily
  31. calculus

    A cone of radius r centimeters and height h centimeters is lowered point first in at a rate of 1 cm/s into a tall cylinder of radius R centimeters that is partially filled with water. How fast is the water level rising at instant the cone is completely

    asked by Dan
  32. CHEm. help please

    The thermodynamic equilibrium constant for the following reaction is 0.15 at 1227°C. 2 SO2(g) + O2(g) 2 SO3(g) Which is true? Can be more than one answer. a. The reaction is product-favored. b. The reaction is reactant-favored. c. G°is less than zero. d.

    asked by carla
  33. Math question

    In a car race, there are 6 Chevrolets, 4 Fords, and 2 Pontiacs. In how many ways can the 12 cars finish if we consider only the makes of the cars?

    asked by Dawn
  34. science

    A frictionless pulley with zero mass is attached to the ceiling, in a gravity field of 9.81 m/s2. Mass M2 = 0.15 kg is being accelerated downward at 1.5 m/s2. Calculate the mass M1.

    asked by lia
  35. chemistry.

    The thermodynamic equilibrium constant for the following reaction is 0.15 at 1227°C. 2 SO2(g) + O2(g) 2 SO3(g) Which is true? Can be more than one answer. a. The reaction is product-favored. b. The reaction is reactant-favored. c. G°is less than zero. d.

    asked by carla
  36. adult education

    California Clinics, an investor-owned chain of ambulatory care clinics, just paid a dividend of $2 per share. The firm’s dividend is expected to grow at a constant rate of 5% per year, and investors require a 15 % rate of return on the stock. 1. What is

    asked by 1time
  37. Physics

    a soccer ball kicked with a force of 14.1 N accelerates at 6.8 m/s^2 to the right. What is the mass of the ball? in units of Kg.

    asked by Nancy
  38. statistics

    We are studying mutual bond funds for the purpose of investing in several funds. For this particular study, we want to focus on the assets of a fund and its five-year performance. The question is: Can the five-year rate of return be estimated based on the

    asked by Anonymous
  39. Economics

    You want to start a company, and are trying to decide between two different industries. You are doing your final research before you write your business plan. Industry A has 20 firms and a Concentration Ratio (CR) of 20% * What is the name for this type of

    asked by Mike
  40. chem class

    Consider the following reaction at equilibrium: 2NH3 (g) N2 (g) + 3H2 (g) ΔH° = +92.4 kJ Le Cha ^ telier's principle predicts that increasing the temperature will shift the reaction to the. a) stays same b)leftc)none d)right i was told right by some

    asked by richy
  41. physics help

    An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.16 s. Its average angular acceleration is 375 rad/s2. Obtain its final angular speed.

    asked by harry
  42. physics

    A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beam. (a) Calculate the magnitude of the tension in the wire. (b) Calculate the magnitude of the

    asked by peter
  43. 6th grade SCIENCE

    I am doing a project on echinoderm and one of the questions is asking about if they have a circulatory system. I have found information that they have a poorly defined opened circulatory system. I also need to answer the difference between if it's closed

    asked by peyton
  44. physics

    a 17 kg car travels in a flat circle . At a certain instant the velocity of the car is 18m/s west and the total acceleration of the car is 2m/s^2 at 51 degrees north west. what is its radius? answer in units of km.

    asked by maira
  45. chemistry

    You want to heat a satellite by radioactive decay of 238 plutonium. Assume you need heating of 200 Watts (J/s), how many Becquerel you need in your plutonium sample, if the decay energy of 238 plutonium is 5.593 MeV? (1 joule = 6.24 x 10^18 eV ) When will

    asked by Anonymous
  46. Chemistry

    1. The reaction, CO(CH2COOH)2 CO(CH3)2 + 2CO2, follows first-order kinetics and has an activation energy of 96.6 kJ mol-1. At 293 K, k = 0.133 s-1. Find the temperature (in K) at which half-live will be 0.00692 min? Round your answer to 3 significant

    asked by Kyo
  47. CHEMISTRYYY

    A hydrated aluminium sulphate A12(SO4)3.xH2O, contains 8.10% of aluminium by mass. Find the value of x

    asked by hana
  48. statistics

    For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The

    asked by Anonymous
  49. Chemistry

    Acetic acid (CH3COOH) reacts with isopentyl alcohol (C5H12O) to yield the ester isopentyl acetate which has the odour of bananas. If the yield from the reaction is 45%, how many grams of isopentyl acetate are formed when 3.77 g of acetic acid and 7.46

    asked by stacy
  50. american history

    The post-war years witnessed a "freedom explosion" across the globe, especially in Asia and Africa. Why did several of these new nations turn to the Soviet Union rather than the United States for support

    asked by i dont know how to
  51. College Chemistry

    Indicate the number of unpaired electrons present in Kr Atom...?

    asked by Rosie
  52. physics

    A 2 kg mass on a horizontal friction-free air track is accelerated by a string attached to a 115 kg mass hanging vertically from a pulley as shown. Compare the accelerations when the masses are interchanged, that is, for the case where the 115 kg mass

    asked by justin
  53. math

    A group of goats&duck s hav a total of 99 heads n legs among thm. Ther r twice as many ducks as ther r goats. How many r ther of ech?

    asked by mar
  54. 5th grade Maths

    With help of the 10 equilateral triangles of side 3 cm, 8 rectangles of 4*2 cm and 4 square of 3*3 cm make 3 structures using all the figures. find the perimeter of all the triangles, squares, and rectangles??

    asked by Jay
  55. Chemistry

    Balanced Chemical Equation: 1 N204(l) + 2 N2H4(l) --> 3 N2(g) + 4 H20(g) If you start with: 5.0 x 10^4g hydrazine (N2H4) "in the tank": 1) How many moles of nitrogen can be created (assuming 100% yielded)? 2) How many moles of water can be produced? 3)

    asked by Roger
  56. math

    20 copies of the school yearbook together weigh 50 lb. What is the weight of each book? How do I set this up?

    asked by Rose
  57. physics

    if a ball, fired as a projectile, travels 30 meters when it leaves the the ground at 20% angel, it will travel the same distance when fired at an angle of what degrees

    asked by luke
  58. Geometry

    Rectangle ABCD has diagonals AC and BD. E is the point of intersection of the two diagonals. If the area of triangle AEB is 8, what is the area of triangle ACD?

    asked by Jen
  59. PERSONAL DEMENSIONS

    WRITE two to three paragraph breifly summarizing the theory and discussing which of the" seven intelligences" apply to you.

    asked by CARLINE
  60. english

    By the end of the eighteenth century, the British public preferred the high moral ground embraced by dramatists to the more vulgar novel. true? or false?

    asked by danny
  61. US history multiple choice

    1. The US foreign policy of the Kennedy Administration: A. tried to prevent the spread of communism by military intervention and peaceful means as well. B. threatened to use the military often, but did little else. C. generally gave in when the Soviets

    asked by anthony
  62. Chemistry

    When 0.59 mol I2(g) and 0.59 mol H2(g) are placed into a 1.0-L container at a given temperature, 0.30 mol H2(g) is found to be present after the reaction below reaches equilibrium. Calculate Kc at the given temperature. I2(g) + H2(g) 2HI(g)

    asked by Shayne
  63. Chem, help please

    Consider the reaction N2 + 3H2 in equilibrium with 2 NH3 . At 25°C Ho = -92.22 kJ and So = -198.53 J/K. Using this information, calculate the equilibrium constant for the reaction at 226°C. (R = 8.314 J/K) Enter your answer using TWO significant figures.

    asked by Shayne
  64. physics help

    An auto race is held on a circular track. A car completes one lap in a time of 16.9 s, with an average tangential speed of 48.1 m/s. Find the following (a) the average angular speed (b) the radius of the track i found part a which was .3716 but need help

    asked by william
  65. Chemistry

    How many moles of a gas at 100 degrees celciuos does it take to fill a 1.00 flask to a pressure of 1.50 atm?

    asked by Natalia
  66. ethics

    Can you explain why these types of organizations have specific organizational cultures? Why does a high risk organization have a "baseball team culture", for example? Why does one go with the other?

    asked by Anonymous
  67. acids and bases

    the following data were collected when titrating 25.00 mL samples of HCL with 0.511 M NaOH: initial burette reading (mL): trial 1=1.06 trial2=0.04 trial3=1.03 final burette reading (mL): trial1= 27.60 trial2=26.21 trial3=27.22

    asked by jj reddick
  68. mis

    Choose one of the following basic business processes: inventory management, operations and manufacturing, HR management, or accounting/financial management. Use the Internet to identify three vendors that license a product to support that process. Compare

    asked by paul
  69. social studies

    Why would it be important for the Alpine countries to maintain good relation with Germany?

    asked by tony
  70. chemistry

    Consider the following reaction at equilibrium: 2NH3 (g) N2 (g) + 3H2 (g) ΔH° = +92.4 kJ Le Cha ^ telier's principle predicts that increasing the temperature will shift the reaction to the. a) stays same b)leftc)none d)right i was told right by some

    asked by richy
  71. chemistry

    A typical air sample in the lings contains oxygen at 100 mm Hg, nitrogen at 573 mm Hg, carbon dioxide at 40mm Hg and water at 47 mm Hg. What is the total pressure on the sample in mm Hg?

    asked by Jazz
  72. algebra

    The following problem has a total of six solutions each. (X^2-5x+5)^x^2-9x+2=1. Its extra credit

    asked by brittany
  73. Chemistry

    C15H30 is a hydrocarbon that reacts with oxygen gas to give carbon dioxide and water. Calculate the mass of water (grams) formed when 859.64 grams of the hydrocarbon reacts with the oxygen gas.

    asked by annonomus
  74. physics

    A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beam. (a) Calculate the magnitude of the tension in the wire. (b) Calculate the magnitude of the

    asked by peter
  75. Inorganic Chemistry

    How can you figure out the melting point of a molecule such as CF4, KF, MgO, or CH3CN.

    asked by Jacqueline
  76. English, 10th grade

    What are 2 complications in the novel, The Plague by Albert Camus?

    asked by Patricia
  77. College Chemistry

    How much ice can be melted at 0oC by the condensation of 1.0 kg of steam at 100.oC? (ΔHfus of ice = 6.01 kJ/mol; ΔHvap of water = 40.7 kJ/mol)

    asked by Molly
  78. Rodriguez

    How many grams of CO2 will be produced when 29.0g of C3 H8 reacts with extra O2?

    asked by Jessica
  79. U.S. History

    Describe the policies of our government regarding immigration during the first 100 years of U.S. history.

    asked by Mark
  80. organic chemistry

    what could be possible answers to these two questions.....1 why determine the amount of solvent by difference and not by weighing the final distillate????? why not distill off all the solvent at the very beginnig and then separate the solid residue of

    asked by Davia
  81. ap physics

    A ball is launched at an upward angle of 45 degrees from the top of a cliff 165 meters high, with a speed of 180 m/s. Use conservation of energy to find how fast it will be traveling when it hits the ground.

    asked by max
  82. physics

    What is the energy in joules of an x-ray photon with wavelength 8.40*10e-10 m? ____J? (b) Convert the energy to electron volts. ___eV ?

    asked by Jessica
  83. Spanish

    14. Victor ______ siempre comemos a las seis. a. y tú b. y yo c. y ella d. y él Can't decide between A and B... 16. Yo ______. Necesito beber algo. a. tengo hambre b. tengo sed c. debo beber d. me gusta B 17. "Te gusta el cafe con leche. ______" "Si, me

    asked by mysterychicken
  84. Math

    12x^2-20x+3 Factor. Cant figure it out.. Thanks!

    asked by Kayla
  85. college physics

    An ideal gas (volume 1.1m3, pressure 103600 Pa, temperature 400 K) undergoes an isothermal process during which it absorbs 2000 J of heat. How much did the entropy of the system increase?

    asked by Nick
  86. Chemistry

    Given the following equation: NH3 +O2 ¨ NO + H2O Calculate the number of grams of ammonia needed to form 40.12 moles of nitrogen monoxide. ok so is this how its to look 4(NH3) + 5(O2) --> 4NO + 6(H20)

    asked by peter
  87. Algebra II

    The discriminant of an equation is 73. How many times will the graph of this equation touch the x–axis?

    asked by Preston
  88. chemistry

    a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?

    asked by Jazz
  89. PHYSICS

    Indentify the direction of the netforce in each of the following situations. A marble moves in a circular path inside a paper plate at a constant speed. The moon orbits the earth. An air hockey puck moves smoothly across the air hockey table after being

    asked by JJ
  90. Early childhood

    the concepts of Natural and logical consequences if you have any examples that would be nice to read.

    asked by new to the site
  91. Statistics

    For each of the following samples that were given an experimental treatment, test whether these samples represent populations that are different from the general population: (a) a sample of 10 with a mean of 44, (b) a sample of 1 with a mean of 48. The

    asked by Felicia
  92. calculus 1

    find the total area between the curve ( y= 4-x to the second power) and the x-axis over the interval [-3,7]

    asked by martin
  93. Chemistry

    Given the following equation: NH3 + NH3 +O2 ¨ NO + H2O Calculate the number of grams of ammonia needed to form 40.12 moles of nitrogen monoxide.

    asked by peter
  94. ethics

    How personally responsible for increasing productivity?

    asked by Anonymous
  95. lit

    the greek base heli- means: 1 self 2 stomach 3 sun 4 mind

    asked by theresa
  96. geometry

    if b is between a and c find the value of x and the measure of bc (ab=3x,bc=5x,ac=8)

    asked by B
  97. physics

    A 2.00 kg block, on a horizontal surface with coefficient of static friction 0.900, is pushed by a force that is directed down at an angle of 30.0 degrees to the horizontal. Find the minimum magnitude of the force needed to get the block to start moving.

    asked by Trace
  98. Science

    A gas filled balloon having a volume of 3.0 L at 1.1 atmosphere of pressure and a temperature of 22 C is allowed to rise into the stratosphere where the temperature and pressure are: - 28 C (note the negative sign) and 0.002 atmospheres , respectively.

    asked by Emily
  99. history maps

    1 5/8 inches represents about how many miles on the scale bar on the political map legend? 3.8 centimeters represents about how many kilometers?

    asked by tatiana
  100. chemistry

    At 298K, Go = -141.8 kJ for the reaction 2 SO2 + O2 in equilibrium with 2 SO3 Calculate the change in Gibbs free energy (in kJ) at the same temperature when P (SO2) = 0.505 bar, P (O2) = 0.80 bar and P (SO3) = 1.317 bar. (R = 8.314 J/K mol)

    asked by tyson
  101. college english 2

    can you please do a commentary on this article. the title is whose class are you in.

    asked by nicola
  102. Algebra

    When graphing y< -6 should the region below linie y= -6 be shaded or should the region above the line y= -6 be shaded?

    asked by Olinda
  103. Economic

    If Apple iPod only played iTunes, and iTunes only could be heard on the Apple iPod, could Apple price the technologically integrated bundle any way they wanted? If other electronic music can play on an iPod, what determines whether there are any

    asked by Anonymous
  104. Tax Accounting

    deduction for AGI Toby, a calendar year tax payer, was employed and resided in NY. On February 2, 2009, Toby was permanently transferred to Florida by his new employer. Toby worked full time for the entire year. In 2009 Toby had the following unreimbursed

    asked by Tiffanie
  105. chemistry

    If 1.70 liters of 0.670 M CuSO4 solution is electrolyzed by passing 4.70 amps through the solution for 3.00 hr using inert electrodes. (a) As electrolysis proceeds, how does the acidity of the solution change? (b) How many grams of Cu metal are formed at

    asked by Dana
  106. English

    im reading othello and i don't understand the meaning of this quote but i will wear my heart upon my sleeve for daws to peck at: i am not what i am please help and thank you

    asked by NeedHelp
  107. US History

    Why do you think freedom and independence were so important to the colonists?

    asked by Lala
  108. physics

    The Cedar Bluff express KAT bus averages 5 mph for 17 minutes, and then 44 mph for 13 minutes. What was its average speed? (mph)

    asked by sandhu
  109. wordd

    Compare and contrast your abilities as an academic writer now as opposed to when you began your studies at college using four comparatives and four superlatives within your responses, explain what has led to these changes

    asked by marcus
  110. math

    1. Give the quadratic relation y=-2x^2+8x+42, find the vertex of the parabola.

    asked by ted
  111. Algebra

    1. solve 3-w/6-w = 3/w-6 2. Find the LCM of (8+9z), (64-81z^2), and (8-9z) 3. Multiply and simplify: 7z^8/10r^2 * 100r^4/49z 4. Add and simplify 2/v + 3/v^2 5. t/5-5t=0

    asked by Anonymous
  112. COM/155

    I wrote these 5 sentences for a assignment and would like some feeback on them as to what I may need to work on. 1.Our education plays (simple present tense) a major role in our future finances. 2.My financial planning class opened (simple past tense) my

    asked by Brandy
  113. math

    i am doing decimals and its estumating decimal prouducts can you help this is the question: 6.3 x 17.59

    asked by krystal
  114. science

    what is the mass of a piece of zinc if it has a volume of 225cm

    asked by bailey lewis
  115. Early childhood

    what do you think of the concept of Negative, intrinsic,and positive reinforcementand could you give some examples?

    asked by Need Help!!!!
  116. Chemistry

    In an industrial process, the following reaction is carried out in the presence of a catalyst: C16H65 + Cl2 ¨ C16H65Cl12 Calculate the percentage yield if 164.57 grams of C16H65 are used in the reaction and 400.24 grams of C16H65Cl12 are produced.

    asked by stacy
  117. Spanish

    Need help with these 3: 19. "¿Por qué te gusta estudiar?" "Pues, _______ me gusta la clase. a. por b. porque c. por qué d. qué 21. Las frutas son _______ para la salud. a. buena b. bueno c. buenas d. buenos 22. "¿Te gusta comer pan tostado con huevo

    asked by mysterychicken
  118. Economics

    You want to start a company, and are trying to decide between two different industries. You are doing your final research before you write your business plan. Industry A has 20 firms and a Concentration Ratio (CR) of 20% * What is the name for this type of

    asked by Joe Smith
  119. calculus 1

    find the total area between the curves ( y= 4-x ^2 ) and the x-axis over the intervals [0,4]

    asked by martin
  120. phyiscs

    A uniform plank of length 4.5 m and weight 233 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 454 N walk on the overhanging part of the plank before

    asked by jason
  121. Spanish

    23. "¿_______ necesitas ayudar en casa?" "Porque mi madre está enferma hoy." a. Qué b. Porque c. Quién d. Por qué D? 24. "¿Que leen Uds.?" "__________" a. Leo con Juan b. Leen en la clase c. Leemos libros d. Lee con la clase Not sure... 25. Yo soy

    asked by mysterychicken
  122. litature

    which word or expression did not originate from the bible? 1.belfry 2.talent 3.scapegoat 4.the hand writing on the wall

    asked by theresa
  123. litature

    the greek combining form -nomy means: 1.pertaining to. 2.act of. 3.rule by. 4.science of.

    asked by theresa
  124. vocab

    intermenttently what does this word mean

    asked by ali
  125. Easy math Q that I can't figure out

    What does the nitrogen cycle do to the islands?

    asked by Hailey
  126. math

    what is 74 dollars minus 30% i think its 51 dollars

    asked by alley
  127. health care law

    who, if anyone, is at fault when a 21 year old injuries his finger and request that an orthopedic doctor perform the surgery. After a second surgery, circulation could not be restored and the finger had to be amputated. After the amputation, the patient

    asked by lida
  128. collegeMath

    The force in newtons needed to stretch a certain spring x centimeters from its resting position is given by the function f(x)=8x^2 where 8 is the spring constant. Find the force needed to stretch the spring 4 centimeters.

    asked by Donovan Henry
  129. chemistry

    if the combustion of oil yields 4.0x10^4 kj/kg what mass of oil must be burned to yield the number of joules in part b? the answer i got in part b was 7.70 x10^11 J and that it right. for this problem i divided the answer i got 7.70x10^11 by 4.0x10^4 and

    asked by MARY :)
  130. physics

    A kettle heats up 1.5L of water from 22 degreesC to 90 degreesC in 4 min. What power did the water receive?

    asked by B
  131. Maryan

    Define and comment on the Marketing Concept. Outline and comment on the role of marketing management within the wider context of the operation of a business enterprise as a whole unit.

    asked by Marketing Management
  132. physics

    How 70 J/sec is related to 54 J/m?

    asked by sam
  133. physics

    if a ball, fired as a projectile, travels 30 meters when it leaves the the ground at 20% angel, it will travel the same distance when fired at an angle of what degrees

    asked by luke
  134. physics

    Suppose I have a spring. I add a mass (m = 1.0 kg) and it is displaced by 15 cm. What is the spring constant k in units of (N/m)?

    asked by lisa
  135. economics

    How can you justify the existence of government-granted monopolies for public utilities such as natural gas distribution and electricity in the light of traditional economic argument that the more competition there is, the more likely it is that an

    asked by Anonymous
  136. physics

    In the Melde's string apparatus, why there is no standing wave in the segment between the pulley and mass hanger?

    asked by sandhu
  137. Algebra

    2x^2+10x+7=0 factor this problem out

    asked by Rose
  138. Tax Accounting

    Jim and Kay Bridges contributed to the support of their two children, Samantha and Amanda, and Jim's widowed parent, Carl. For 2009, Samantha, a 19 year old full time college student, earned $4,500 as a baby-sitter. Amanda, a 23 year old bank teller,

    asked by Tiffanie
  139. us history

    Why did public opinion and our government's policies on immigration in general change in the early 1900s?

    asked by Liberty
  140. English Q#2

    "Though I do hate him as I do hell-pains, Yet, for necessity of present life, I must show out a flag and sign of love, Which is indeed but sign." i don't know what this quote means this is what i think: "even though i hate him but for now i will show my

    asked by NeedHelp
  141. Pre-Cal

    A circular gear turns 60 per hour. Through how many radians does it turn in a 24-hour day?

    asked by De'Steven
  142. CHEM

    a mixture of n2 and O2 contains 2.7 g of O2 and occupies 3.1 L at 28 degrees celcius, 810 mm Hg. how many grams on N2 are there

    asked by MAX
  143. US history multiple choice

    When Kennedy was elected president, many were: A. fearful because he had not won a majority of the popular vote. B. pleased because of his clear experience. C. fearful because he had appointed such controversial people to the cabinet. D. pleased because of

    asked by anthony
  144. 8th grade

    what is the density of an unknown liquid that has a mass of 44.0g and volume of 55.0mL

    asked by Jimmy Hook
  145. chemistry

    The ionization potential of N is less than O, but larger than M.

    asked by Eureka
  146. math

    number of cars by make owned by 100 one-car owners

    asked by Anonymous
  147. Algebra II

    3. To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a. Write an equation using only one

    asked by Anonymous
  148. Math116/a

    2. Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26, and in January 2006, the price of regular unleaded gasoline was $2.31 (“Consumer price index,” 2006). Use the coordinates (1997,

    asked by Nicole
  149. comp 155

    Write three sentence using plurals correctly and three sentences using possessives correctly on the topic of how to store personal financial information effectively and efficiently.

    asked by lorretta
  150. 12th grade

    Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the element have very different melting temperatures and densities. The unknown substance is

    asked by Chelsie
  151. college

    Is this correct? Write the following as a common fraction or mixed number. 5.679 = 5.679 = 5 679/1000. It cannot be reduced

    asked by heather
  152. US History multiple choice

    1. Kennedy's record on civil rights: A. did not exist. B. was completely revolutionary. C. produced mixed results. D. was accepted by Congress. I think it's C but I'm not 100% sure.

    asked by anthony
  153. Statistics

    For a population that has a standard deviation of 10, figure the standard deviation of the distribution of means for samples of size- (b) 3.

    asked by Felicia
  154. English

    She also makes a very important remark that explains Samsara, “You have a good soul, but it’s like you waited your whole life for something”. can you please tell me if the second sentence with the is gramatically-sentence structure wise okay thank

    asked by sanjeevan
  155. Algebra

    show me the steps to solve: z-5-7(z-3)+3(5z+1)

    asked by Winona
  156. grade 12 data management

    Q- 2 cards are drawn without replacement from a deck of 52 cards. What is the probability that the both card are aces given that they are the same color? I am having a hard time with this question. If anyone knows this I would appreciate it very much

    asked by mike
  157. chemistry

    follows first-order kinetics and has an activation energy of 244 kJ mol-1. At 684 K, k = 0.00000508 s-1. What is the half-life (min) for this reaction at 427 °C ? Round your answer to 3 significant figures. I really don't know what to do

    asked by bobjahng2
  158. language arts

    What is the sense of the word "starts" in the sentence below? By doing this she starts something she did not know was going to happen. Is the answer intermenttently?

    asked by ali
  159. English

    I need help finding 3 book sources and 2 other sources that criticize the poem Death be not proud by John Donne

    asked by Danielle
  160. Finance

    if you require an 11 percent return on your investment, how uch will you pay for the company's stock today?

    asked by Romey
  161. lit

    which word did not originate from military language? 1 pioneer 2 phrase 3 salary 4 trophy

    asked by carl
  162. college physics

    An ideal gas (volume 1.1m3, pressure 103600 Pa, temperature 400 K) undergoes an isothermal process during which it absorbs 2000 J of heat. How much did the entropy of the system increase?

    asked by Nick
  163. greek vocab.

    which word did not originate from the word of the arts? 1. maudlin 2. martyr 3. character 4. colossal

    asked by carl
  164. chemistry

    The following reaction has an equilibrium constant of 0.50 at a given temperature. HCHO(g) CO(g) + H2(g) If you have 0.55 moles of HCHO(g) in a 1.0L container initially, how many moles of HCHO will be present when the system reaches equilibrium?

    asked by Adrianne
  165. chemistry

    if the combustion of oil yields 4.0x10^4 kj/kg what mass of oil must be burned to yield the number of joules in part b? the answer i got in part b was 7.70 x10^11 J and that it right. for this problem i divided the answer i got 7.70x10^11 by 4.0x10^4 and

    asked by MARY :)
  166. MEDICAL CODING AND BILLING EXAMINATION 38189800

    WHICH OF THE FOLLOWING CODES WOULD BE USED TO REPORT THE REPAIR OF ONE SUPERFICIAL 1-CM LACERATION, ONE SUPERFICIAL 3-CM LACERATION, AND ONE SUPERFICIAL 2-CM LACERATION, ALL TO THE CHEEK? CAN SOME ONE PLEASE HELP ME WITH THIS EXAM 38189800

    asked by JULIANNA
  167. calculus

    Evaluate. int_(pi)^(pi) (sin(x))^(3) (cos(x))^(3) dx

    asked by sam
  168. social studies

    How has increased urbanization affected the societies of Spain and Portugal?

    asked by tony
  169. Chemistry

    If 30.3 liters of O2 at 273K and 1 atm are produced by the electrolysis of water, how many coulombs of charge were required?

    asked by Dana
  170. vocab

    what does controversial mean?

    asked by Anonymous
  171. Chemistry

    If 30.3 liters of O2 at 273K and 1 atm are produced by the electrolysis of water, how many coulombs of charge were required?

    asked by Dana
  172. Accounting II

    What would be the journal entry to record ten $2,000, 6%, 10 year bonds at 96 on January 1st?

    asked by Leona Davis
  173. Chemistry

    If 30.3 liters of O2 at 273K and 1 atm are produced by the electrolysis of water, how many coulombs of charge were required?

    asked by Dana
  174. Chemistry

    If 1.70 liters of 0.670 M CuSO4 solution is electrolyzed by passing 4.70 amps through the solution for 3.00 hr using inert electrodes.

    asked by Dana
  175. PLEASE HELP/ALGEBRA 1

    PLEASE HELP THANK YOU. I need to evaluate this equation with the following inputs. F(x) = 5x -12 Input: 3 and 2

    asked by CANDY
  176. College Chem

    How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?

    asked by Lisa
  177. englsh

    what is the most inportant symbol of freedom the slaves.( in a narrative life of fredrick douglass?

    asked by ashely
  178. math

    A rectangular animal pen will be built using 200 meters of fencing. If one side of the rectangle is meters, find the area of then pen.

    asked by Shauna
  179. physical

    C.How much work does the ride do to lift theriders up to a height of 50 meters?

    asked by Anonymous