# Questions Asked onMarch 24, 2013

1. ## Chemistry

For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply. n=1 l=0 ml=-1 ms= +1/2 n=1 l=0 ml=0 ms=-1/2 n=2 l=1 ml=0 ms= -1/2 n=1 l=0 ml=0 ms=+1/2 n=2 l=1 ml=1 ms=+1/2 n=2 1=0 ml=0 ms=+1/2 n=2

2. ## chemistry (Pls Bob check for me)

A 0.5g of fuming h2so4 oleum is diluted with water. This solution is completedly neutralized by 26.7ml of 0.4N naoh. Find the percentage of free so3 in the sample The asnwer 20.6% My calculation h2so4= 98/2 = 49 so3= 80/2 = 40 26.7ml x 0.4N = 10.68ml -

3. ## math

Mark averaged 60 miles per hour during the 30-mile trip to college. Because of heavy traffic he was able to average only 40 miles per hour during the return trip. What was Mark's average speed for the round trip?

4. ## Chemistry

The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ν0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.48 × 1014 s–1. With what kinetic energy will

5. ## Chemistry

The energy levels of one-electron ions are given by the equation: En=(-2.18*10^(-18)J)(Z^2/n^2) The series in the He spectrum that corresponds to the set of transitions where the electron falls from a higher level to the nf = 4 state is called the

6. ## statistics

solve this math statistic problem: an insurance company insures a person's antique coin collection worth $20,000 for an annual premium of$300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's

7. ## Chemisry

Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.

8. ## MATH

WHICH BENCHMARK FRACTION COULD YOU USE TO ESTIMATE THE PRODUCE OF 36 X 11/16?

9. ## Physics

In Oersted's experiment, suppose that the compass was 0.30 m from the current-carrying wire. If a magnetic field of 1/3 the Earth's magnetic field of 5 10−5 T was required to give a noticeable deflection of the compass needle, what current must the wire

10. ## Physics

To construct a solenoid, you wrap insulated wire uniformly around a plastic tube 12 cm in diameter and 45 cm in length. You would like a 2.0-A current to produce a 2.1-kG magnetic field inside your solenoid. What is the total length of wire you will need

11. ## Physics

1. At what height above the earth is the free-fall acceleration 30% of its value at the surface? 2. What is the speed of a satellite orbiting at that height?

12. ## Algebra

Can someone please help me with a couple questions? 1)The probability that a dessert sold at a certain cafe contains chocolate is 73%. The probability that a dessert containing chocolate also contains nuts is 25%. Find the probability that a dessert at

13. ## Statistic

Below are listed the numbers of doctors in various specialties by gender. Pathology Pediatric Psychiatry Male 12,575 33,020 27,803 Female 5,604 33,351 12,292 Choose 1 doctor at random. (a) Find the probability of choosing a Pathologist or a female? b.)

14. ## Chemistry

What do we mean when we say that concentrated nitric acid (HNO3) is 16 molar?

15. ## Math

of 53 plays attributed to a playwright, 16 are comedies, 18 are tragedies, and 19 are histories. if one play is selected at random, find the odds against selecting a tragedy.

16. ## MA 107 college algebra

Each side of a square is lengthened by 2 inches. The area of this new, larger square is 81 square inches. Find the length of a side of the original square.

17. ## stats

A study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. Suppose a researcher believes that in accounting firms this figure is lower. The researcher randomly selects 415 accounting firms and through interviews

18. ## Chemistry

One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) ? FeCl2(aq) + H2(g); (Delta)H°= –87.9 kJ How much heat is liberated at constant pressure if 0.215 g of iron reacts with 40.4 mL of

19. ## college math

How many different committees can be formed from 9 teachers and 39 students if the committee consists of 2 teachers and 3 students? In how many ways can the committee of 5 members be selected?

20. ## Physics

The ultracentrifuge is an important tool for separating and analyzing proteins in biological research. Because of the enormous centripetal accelerations that can be achieved, the apparatus must be carefully balanced so that each sample is matched by

21. ## general chemistry

What is the radius of the largest sphere that can be placed at the center of a face-centered cubic unit cell of a cubic closest-packed array of spheres if the spheres have radius of 2.0 x 10^2 pm?

22. ## economics

Maria can read 20 pages of economics in an hour. She can also read 50 pages of sociology in an hour. She spends 5 hours per day studying. a. Draw Maria's production possibilities frontier for reading economics and sociology. b. What is Maria's oppurtunity

23. ## Physics

A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 59.82 diopters, and the lens-to-retina distance is 1.686 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard is 4.81

24. ## Chemistry

Which of the following electron configurations of neutral atoms represent excited states? [Xe]6s^2 4f^1 [Ar]4s^2 3d^3 1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 [Kr]5s^1 4d^5 2s^2 Which neutral atoms have the following electron configurations? Enter the name or symbol.

25. ## math

a driver comes to pick up members of your family (20 members) for a family reunion. the van holds 7 people not including the driver. assuming none of the babies will be riding (2 babies in the group of 20) how many different ways can 7 people be chosen to

26. ## Chemistry

For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply. n=1 l=0 ml=-1 ms= +1/2 n=1 l=0 ml=0 ms=-1/2 n=2 l=1 ml=0 ms= -1/2 n=1 l=0 ml=0 ms=+1/2 n=2 l=1 ml=1 ms=+1/2 n=2 1=0 ml=0 ms=+1/2 n=2

27. ## MATH

ESTIMATION. WHICH IS THE BEST ESTIMATE FOR THE AREA OF A SQUARE WITH SIDES EQUAL TO 4 1/8 INCHES?

28. ## math

After six biology tests, Ruben has a mean score of 73. What score does Ruben need on the next test to raise his average (mean) to 75?

29. ## statistics

The grades on the final examination given in a large organic chemistry class are normally distributed with a mean of 72 and a standard deviation of 8. The instructor of this class wants to assign an “A” grade to the top 10% of the scores, a “B”

30. ## Chemistry

Na2CO3 reacts with H2SO4 to give respective salt water and carbon dioxide. Calculate the mass of pure salt formed when 300 g of Na2CO3 of 80% purity reacts with H2SO4

31. ## MATH

BRYCE HAS 24 BASEBALL TROPHES. MATT HAS 3/4 AS MANY TROPHIES AS BRYCE. HOW MANY TROPHIES DOES MATT HAVE?

32. ## Chemistry

Calculate the pressure of 0.800 moles of helium gas, when the gas is in a balloon with a volume of 2.30 L at a temperature of 32°C.

33. ## story problems

jordan made 3/5 of a recipe that called for 2 1/3 cups of sugar. how much sugar was used

34. ## Math

Find the area of a circle with a radius of 8 cm. Use 3.14 for pi. Type your answer as a number only. Find the area of a triangle with a base of 6 cm and a height of 3 cm. Remember your formula. Question 4 Find the area of a figure with base #1 of 4 in.,

35. ## physics

As your hand moves back and forth to generate longitudinal pulses in a spiral spring, your hand completes 3.26 back-and-forth cycles every 8.31 s. The velocity of the pulse in the spring is 1.47 cm/s.

36. ## general chemistry

KCl crystallizes in a structure like NaCl. The ionic radius of Na+ is 0.525 times the ionic radius of Cl^- and 0.714 times the ionic radius of K+. What is the ratio of the density of NaCl to that of KCl?

37. ## physics

a proton (mass 1.67 x 10^-27 kg) with a velocity of 1.10 x 10 7 m/s collides with a motionless helium nucleus, and the proton bounces back with a speed of 6.00 x 10 6 m/s. The helium nucleus moves forward with a velocity of 4.00 x 10 6 m/s after the

38. ## statistics

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2. If the variable is normally distributed, what is the probability that a randomly selected town will have a homicide rate greater than

39. ## math

monica spent 8/13 hours listening to tapes of beethoven and brahms. she spent 2/5 hours listening to beethoven. how many hours were spent listenign to brahms

Please show me step by step. Thank you. One commercial method used to peel potatoes is to soak them in a solution of NaOH for a short time, remove them from the NaOH, and spray off the peel. The concentration of NaOH is normally in the range of 3 to 6 M.

41. ## math

A professor grades students on three tests, four quizzes, and a final examination. Each test counts as two quizzes and the final examination counts as two tests. Sara has test scores of 60, 80, and 89. Sara's quiz scores are 85, 94, 83, and 84. Her final

42. ## Physics

A charge of q1=1×10−6 C is located at corner A of an equilateral triangle. A charge q2=4×10−6 C is located at corner B and a charge of q3=7×10−6 C is located at corner C. The distance AB=0.46 m (the other two sides of the triangle are the same).

43. ## math

A professor grades students on three tests, four quizzes, and a final examination. Each test counts as two quizzes and the final examination counts as two tests. Sara has test scores of 60, 80, and 89. Sara's quiz scores are 85, 94, 83, and 84. Her final

44. ## physics

The lens and mirror in the figure below are separated by d = 1.00 m and have focal lengths of +74.9 cm and -56.4 cm, respectively. An object is placed p = 1.00 m to the left of the lens as shown.

45. ## Quantum Physics

Suppose we ran m steps of Grover's algorithm on some function f (which has one marked element y) and the resulting superposition was exactly |y>. (a) What was the state after the (m−1)th step? Note that you can describe the superposition by specifying

46. ## Math HELP

For the angle shown is a point given on its terminal arm. [picture shows -12, -5 in quadrant three of the unit circle]. Calculate the values of the three primary trigonmetric ratios, accurate to four decimal places. Dont understand thissss

47. ## Chemistry

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

48. ## chemistery

How much heat, in joules and calories, is needed to heat up 295 mL of water from 26.6 °C to 85.1 °C? Assume the density of water to be 1.00 g/mL.

49. ## chem

Assume that 35.0 mL of a 0.13 M solution of a weak base B that accepts one proton is titrated with a 0.13 M solution of the monoprotic strong acid HX. (a) How many moles of HX have been added at the equivalence point?

50. ## chemistry

calculate the mass in grams of hydrogen chloride produced when 5.25 L of a molecular hydrogen measured at STP reacts with an excess of molecular chlorine gas

51. ## Counseling

are there in big differences in the ACA and NCDA codes of ethics?

52. ## MATH

SHOW THREE WAYS TO ESTIMATE 3/5 X 9 1/2. IDENTIFY EACH METHOD YOU USE.

53. ## Science

A thermally insulated 50ohm resistor carries a current of 1A for 1s. The initial temperature of the resistor is 10degree, its mass is 5g, and its specific heat capacity is 850j/kg/k. Calculate the change in entropy of the resistor and what is the change in

54. ## Algebra 2

Let (x) be defined for all positive integer values of x as the product of all even factors of 4x. For example, (3)=12x6x4x2=576. What is the value of (5)?

A truck driver, on assignment from the owner of the truck is to drive on a 300 mile stretch of highway at a constant speed of v miles per hour. According to road signs, the minimum speed allowed is 55 miles per hour and the speed limit is 70 miles per

56. ## Science

A thermally insulated 50ohm resistor carries a current of 1A for 1s. The initial temperature of the resistor is 10degree, its mass is 5g, and its specific heat capacity is 850j/kg/k. Calculate the change in entropy of the resistor and what is the change in

57. ## Math

If a man casts 14 foot and a child casts a 9'4" shadow at the same time how tall is the man?

58. ## Science

A thermally insulated 50ohm resistor carries a current of 1A for 1s. The initial temperature of the resistor is 10degree, its mass is 5g, and its specific heat capacity is 850j/kg/k. Calculate the change in entropy of the resistor and what is the change in

59. ## math

The surface area of the Great Pyramid at Giza was about 1,496,980 square feet when it was built. A model of this pyramid has a surface area of 599 square inches. what is the scale factor from the model to the actual pyramid?

60. ## Calculus

A rectangular box with square base (which is NOT necessarily a cube) and NO top is to be made to contain 9 cubic feet. The material for the base costs $2 per square foot and the material for the sides$3 per square foot. Find the dimensions that minimize

61. ## algebra

the larger leg of a right triangle is 7ft longer than its samller leg. the hypotenuse is 1ft longer than the larger leg. how many feet long is the samller leg?

62. ## Calculus/ Optimization

A truck driver, on assignment from the owner of the truck is to drive on a 300 mile stretch of highway at a constant speed of v miles per hour. According to road signs, the minimum speed allowed is 55 miles per hour and the speed limit is 70 miles per

63. ## MATH

JENNA LIVES 4 3/10 MILES FROM SCHOOL. SHE ESTIMATES THAT SHE TRAVELS 4 X 2 X 5, OR 40 MILES EACH WEEK. IS HER ESTIMATE AN OVERESTIMATE OR AN UNDERESTIMATE? EXPLAIN.

64. ## Math- Calculus

find the dimensions of a rectangle of maximum size that will fit into a half circle of radius 30 cm.

65. ## math

The monthly demand function for a product sold by a monopoly is p = 3750 − 1/3x^2 dollars, and the average cost is C = 1000 + 70x + 3x^2 dollars. Production is limited to 1000 units and x is in hundreds of units. (a) Find the quantity that will give

66. ## Chemistry

Assuming that the smallest measurable wavelength in an experiment is 0.410 fm (femtometers), what is the maximum mass of an object traveling at 395 m·s–1 for which the de Broglie wavelength is observable?

67. ## Spanish

Verb Distinction Give the correct form of the appropriate verb, saber or conocer, which would be used in writing the following sentences in Spanish. Be sure the verb is written in correct form to agree with the subject of the sentence and also in the

68. ## Physics

A ball rolling on an inclined plane dors so with constant acceleration. One ball, A, is released from rest on the top of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same

69. ## Chemistry

Ethyl alcohol which is prent in many beverages molecular formular C2H6O.If 9.2g of ethyl alcohol are available.Calculate number of molecular of ethyl alcohol 9.2g of ethyl alcohol.

70. ## Applied Behavioral Science

Recognizing Culture Gaps As a leader, how might a leader recognize a culture gap? What are some techniques leaders might use to influence and change cultural values when necessary?

71. ## algebra

the number of gallons of water,y,after x hours maybe modeled by the linear equation y=800-50x. Which of the following statements is true, a.it is filling at a rate of 800 gallons per hour/b.it is filling at a rate of 50 gallons per hour/c.it is emptying at

72. ## calculus

Find the integral. x^4/the square root of (x^5-1)

73. ## Chemistry

The Ka of a monoprotic weak acid is 8.11 x 10 ^ -3. What is the percent ionization of a 0.125M solution of this acid?

74. ## Physics

in a childrens soccer game, one of the children kicks the ball from the ground, giving it an itial velocity of 22m/s a) what height and range does the ball reach? b) How high is the ball 2.25s into flight?

75. ## math

if you deposit $700 a month in a savings account that earns 4% interest compounded monthly. how many months to get$3500 and what is the balance in the account.

76. ## Physics

Which describes the greatest displacement? - walking 3 m east then 3 m north, then 3 m west - walking 3 m north, thrn 3 m west, then 3 m south

77. ## english

"A Noiseless Flash" by John Hersey? List one fiction technique and one nonficiton technique from the selection and descsribe the effects of each on readers. Please help cause I suck at this!!

78. ## math

if you deposit $700 a month in a savings account that earns 4% interest compounded monthly. how many months to get$3500 and what is the balance in the account.

79. ## chemistry

At a certain temperature, the concentrations of NO and NH3 are equal, and the concentration of H2o and o2 are 2.0M and 3.0M respectively. What is the value of Keq at this temp? The equation is 5O2+4NH3--> 4NO+6H20

80. ## MA 107 college algebra

Simplify the expression using the power rule.(3to the power of 2)to the power of 5

81. ## Algebra

Use a graphing calculator or a computer to graph the system of inequalities. Give the coordinates of each vertex of the solution region. 5x-3y is greater than or equal to -7 x-2y is greater than or equal to 3 3x+y is greater than or equal to 9 x+5y is less

82. ## accounting

Tribke Enterprises collected the following data from its financial reports for 2012: Stock price $18.37 Inventory balance$300,000 Expenses (excluding COGS) $1,120,000 Shares outstanding 290,000 Average issue price of shares$5.00 Gross margin % 40%

83. ## Algebra

Use completing the square to describe the graph of the following function. Support your answer. f(x)=-2x^2+4x+1

84. ## College Physics

A child's toy consists of a toy car of mass 0.100kg which is able to roll without friction on the loop-the-loop track shown. The car is accelerated from rest by pushing it with force F over a distance d, then the car slides with a constant velocity until

85. ## physics

A compact car can achieve a maximum acceleration of 3.2 m/s^2. If dice were hanging from the rearview mirror, what angle would they swing on?

86. ## Algebra

At a portrait studio, three 8- by 10-inch pictures plus two 5- by -inch pictures cost $52, and two 8- by 10-inch pictures plus 5- by 7-inch pictures cost$40. This situation can represented by the system of equations below, where x is the cost, in dollars,

87. ## Physics

Aoron leaves one cify at noon. He has to be at another city 186 km away at 3:00 p.m, the speed limit the entire wAy is 65 km/h . Can he arrive At the second city on time? Explain

88. ## Math- Calculus

A company needs to produce a cylindrical can to hold water. It must have a volume of 500ml. The side of the can will cost 40$/m^2 to produce and the top and bottom of the can will cost 50$/m^2 to produce. Find the most economical dimensions.

89. ## physics

The system shown in the figure below consists of a m1 = 5.52-kg block resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging m2 = 2.76-kg block.The

90. ## physics

A car traveling at 150 miles/hour strikes a wall and bounces backwards at 30 miles/hour. If the car is in contact with the wall for 0.1 seconds, what is the force that the car exerts on the driver.

91. ## statistics

In a recent study on gender differences in education, a sample of 7 boys had a mean score of 18.5 and a standard deviation of 4.1 on a Standardized Math Test. A sample of 11 girls had a mean score of 19.9 and a standard deviation of 3.6 on the same test.

92. ## physics

The system shown in the figure below consists of a m1 = 5.52-kg block resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging m2 = 2.76-kg block.The

93. ## physics

The system shown in the figure below consists of a m1 = 5.52-kg block resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging m2 = 2.76-kg block.The

94. ## chemistry

what is the total heat lost if you have 8 grams of copper and the temperature changed from 43°C to 36°C

95. ## Math

For the angle shown is a point given on its terminal arm. [picture shows -12, -5 in quadrant three of the it circle]. Calculate the values of the three primary trigonmetric ratios, accurate to four decimal places.

96. ## Math

For a chemistry experiment, Heather needs 3.75 grams of salt. How many decigrams of salt does Heather need?

97. ## chemistry 2 college

explain how to find the mass of solute in the solution: 50.0g of solvent in a 10.0% NaCl solution?

98. ## Statistic

Suppose that 15 students take a quiz and everyone in the class scores an 80. The standard deviation of scores for this quiz is ____________?

99. ## chemistry

Tantalum metal is produced by reaction of potassium heptafluorotantalate (K2TaF7) with elemental sodium (Na) in a reactor heated to 850oC. The by-products are potassium fluoride (KF) and sodium fluoride (NaF). The reactor is charged with 244.0 kg of K2TaF7

100. ## Chemistry

• Describe the properties of acids and bases and explain the concept of pH • How will you measure the pH of the soil in your garden • How will pH affect materials and equipment you might use in gardening. • 3 vegetables and 3 flowers that would

101. ## science 207

chronic asthms when caused by air p[ollution is ,most likely due to: short term pollutant exposer long term pollutant exposer thbe weather during an episode of pollutant expossure exposure to a cerain kind of pollutant

102. ## math

please help me how to solve the integral sinx/x dx from 0 to infinite : ∫_0^∞▒〖sin⁡x/x dx〗 thank you

103. ## College Algerbra

THE TEMPERATURE ON A SUMMER DAY IS // DEGREES FAHRENHEIT.the formula to convert the temperature to degrees Celsius is C = 5/9(F-32) what is the corresponding temperature in degrees Celsius?

104. ## Using the remainder

use the remainder theorem to find the remainder when f(x) is divided by x - 3. Then use the factor theorem to determine whether x-3 is a factor of f(x) f(x)=2x^3-10x^2+11x+12

105. ## chemistry

If 3.12 kg of S are reacted with oxygen calculate the volume of SO2 gas in mL formed at 35 degrees Celsius and 1.09 atm

106. ## Dynamics

The 10 kg block shown is released from rest on the horizontal surface at point B, where the spring has been stretched a distance of 0.5 m from its neutral position A. The coefficient of kinetic friction between the block and the plane is 0.30. Calculate

107. ## physics

a ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same

148. ## phi 208 ethics and moral

The First Cause argument for the existence of God assumes that

149. ## College Algerbra

Solve the inequality. - 5x / 7 -2>-1

150. ## cycles of matter (life science)

How does the Laws of Conservation of Matter and Energy relate to the Cycles in Nature?

151. ## science

What will eventually occur if in deep space an astronaut's wrench is outside the spacecraft moving with the same velocity as the spacecraft?

153. ## algebra

list the domain and the x- and y- intercepts of the following function. Graph the funciion. Graph the function. Be sure to label all the asymptotes.

154. ## biomechanics

Suggest how a snail and a large dog develop linear momentum.

155. ## stats

One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.

156. ## prcalculus

change the logarithmic expression to an equivalent expression involving an exponent. log416=x

157. ## Chemistry

calculate the volume of 0.50 M NaOH needed to saturate 100.0 ml of 0.50 M Zn(NO3)2 with Zn(OH)2

158. ## College algebra

Find the vertical, horizontal, and qblique asymptotes, if any, for the following rational function. T(x)=x^2/x^4-256

159. ## biology

Why humans not evolve with one central repository of DNA rather than having it replicated throughout the body?

160. ## College Algerbra

Solve the inequality. 0.1(0.1x+0.1) _< -0.8

161. ## UOP

Use the value d= rt to find the variable D= 100 feet t =25 second

162. ## Math- Calculus

A company offers the following charges: \$54 per thousand for orders of 62000 or less with the charge per thousand decreased by 38 cents for each thousand above 62000. Find the order which will make the company's revenue a maximum.

163. ## chemistry

How many grams are in 4.00mol of sodium chloride (\rm NaCl)

164. ## Chemistry (Immunoassays)

What is the common component that makes a homogeneous competitive immunoassay? Describe one.

165. ## stats

How do you perform the One-way ANOVAs A researcher is interested in examining whether knowledge of a previous criminal record will affect the juryfs decision to acquit or convict the defendant. The researcher shows 15 participants a 4-hour trial in which

166. ## algebra

write and inequality describing this region. will an 18 wheeler hold 71 refrig's and 118 tv's or will it hold 51 refig's and 176 tv's?

167. ## geography

What does the word napasta mean in english?

168. ## Chemistry

A 5.0 mL sample of HCl is placed in a flask. Titration required 15.0 mL of .20 M NaOH. What is the molarity of the HCl in the sample?

169. ## Stats.

One hundred subjects in a psychological study had a mean of 35 on a test instrument designed to measure anger. The study the ó=10. Find a 99% confidence interval for the mean anger score of the population.

170. ## Chemistry

K1 = 0.727 K2 = 12.1 T1 = 2000 T2 = 3000 Solve for the standard enthalpy of formation. They gave me the formula ln(K2/K1) = DeltaH /R (T2 - T1 / T1T2) The answer is supposed to be in KJ/mol and I keep getting 2.022 but its not right. I'm not sure what Im

171. ## college algebra

determine the vertical asymptotes of the graph of function.g(x)=x^3 diveded by 5x^3-x^2-22x

172. ## math

Classify each statement as sometimes, always, or never true. A. 2^(2/3)*4^(4/3)=8*2^(1/3) B. If x>0, then (squareroot x*squareroot 2)^3 =x^(3/2) 2^(3/2) C. If x>0, then (squareroot x+ squareroot 2)^3 =x^(3/2) 2^(3/2) D. The only solution to x^(2/3)= 4 is

173. ## Calculus 2

Find the arclength of y=x^3/3+1/(4x) from 1 to 2. I know that arclength is the integral from 1 to 2 of the sqrt of (1 + (y')^2)dx, but have not been able to figure out how to evaluate the integral. Your help is much appreciated!

174. ## Waves and the Media

What do mechanical waves such as sound need that electromagnetic waves do not?

175. ## math

in triangle ABC, AB = BC and ABC = 42. find ACB

176. ## science 297

chronic asthma when caused by air pollution is most likely due to

177. ## Trig

prove that tanA divided by the sinA equals the secA

178. ## deutsch

bitte erkläre mir die wörter: eigenartige weisen schürzte seie kleider allerlei ausflüchten schwarm die Kunde Ungesäumt spielmann senkung eines hügels danke! ps: schreibe mir eine schnelle antwort!!!

179. ## Chemistry

calculate the volume of 0.50 M NaOH needed to saturate 100.0 ml of 0.50 M Zn(NO3)2 with Zn(OH)2

180. ## Algerbra

in the equation y=4x,if the value of x is increased by by 2,what is the effect on the value of y?

181. ## Algerbra

WHAT IS THE EXPRESSION THAT IS EQUIVALENT TO -3(X-2)

182. ## Algebra 2

How do i find the answer to 1/9-1/x divided by 1/81-1/x^2

183. ## maths

What is Mersenne prime?

184. ## math

I wold like to know if I have this answer right? Factor the trinomial competely. x^2-x-2 My answer is (x-2)(x+1)

185. ## math

Can you show me how to solve this using logarithims? thank you 3e^-3x = 10.21 for x.

SOLVE.8X+7=6

187. ## inequality

solve the inequality (x+8)^2(x-4) > 0

188. ## Properties and changes of matter

what gets hot and cold faster, solid or gas and why?

189. ## Reliability of Evidence

what are ways scientists try to keep their results valid when experimenting?

190. ## maths

Solve the inequality //(2x-1)(x+3)/-4/< 1 where /x/ is the modulus of x.

191. ## math

third-degree polynomial with real coefficients -4 -3