# i need the exat percentage of nitrogen in magnesium nitride

6,975 results, page 46
1. ## calc

Give the starting value a, the growth rate r, and the continuous growth rate k. Round the answer for r to two decimal places Q = 0.414(e^0.885)^t a = ? r = ?% k = ?% I found a to be 0.414 but when finding the percentage for r and k I got stuck.

asked by lenny on October 3, 2014
2. ## math

You sell and service vacuum cleaners. Your price on a particular model is \$125. However, to get a service contract, you offer to sell it for \$115. How much discount are you giving as a percentage of price (to the nearest tenth)?

asked by Anonymous on April 16, 2014
3. ## math

Farmer Rex planted 48 rows each having 30 corn trees. a) How many corn trees did he plant? b) 1006 plants grew. What percentage of the plants did not grow?

asked by indira on November 29, 2016
4. ## Math

A balloon is slowly losing air , decreasing from a volume of 75cubic cubic inches to 55 cubic inches.What is the balloons percentage decrease in volume

asked by Destiny acott on November 30, 2012
5. ## chemistry

Copper (II) flouride contains 37.42% F by mass. Use this percentage to calculate the mass of flourine (in grams) contained in 35.6 g of copper (II)fluoride. --- How many grams of Cl are present in 55g of CFCl3?

asked by Anonymous on March 26, 2008
6. ## math (check answer plz)

Types........ Adults Children Total Chocolate Chip 5 10 Peanut Butter 8 6 Oatmeal 7 4 -------------------------------------------------------------------------------------------------------------------------------- What percentage of the children chose

asked by me on May 2, 2014
7. ## Corporate Finance

You have just taken a 30-year mortgage loan for \$200,000. The annual percentage rate on the loan is 8%, and payments will be made monthly. Estimate your monthly payments.

asked by Randa on March 31, 2017
8. ## chem help

i just don't know where to begin/how a) Write a balanced chemical equation for: potassium carbonate + magnesium chloride b) Write a balanced chemical equation for: sulfuric acid + calcium carbonate c) Write a balanced chemical equation for: sodium sulfate

9. ## Chemisty

Iodine monobromide and ammonia react to produce nitrogen triiodide and ammonium bromide. (a) Balance the chemical equation for this reaction. (Use the smallest possible whole numbers. Enter 1 where appropriate. Do not leave any answer box blank.) . IBr(s)

asked by Megan on November 17, 2011
10. ## MATH

THE INTEREST RATE ON AN AUTO LOAN IN MAY WAS 12 3/8 BY SEPTEMPER THE RATE WAS UP 14 1/4 % HOW MANY PERCENTAGE POINTDID THE INTEREST RATE INCREASE

asked by SHIRLEY on January 17, 2010
11. ## Maths

60% of the people on a bus are male. After 1/3 of the males alighted from the bus, what percentage of the people left on the bus are females?

asked by jo on August 20, 2011
12. ## Math

percentage increase & decrease original amount 20 decrease % _blank new amount 19 What is the formula used to get the decreased amount?

asked by Amari on October 21, 2017
13. ## math

if 600 kids go to school and 240 walk to school what percentage walk to school ? show how to get the answer

asked by Anonymous on February 28, 2012
14. ## Biology

When a normal female (XX, +/tra) Drosophila is crossed with a normal male (XY, tra/tra), what would be the percentage of males ?

asked by Mini on March 5, 2018
15. ## math

john had 1/3 blue candy, 1/4 orange candy, 1/8 green candy. and the rest was orange. What percentage was red?

asked by vwenwm on June 26, 2014
16. ## math

Find the retail price. List price of article = \$2,150 Percentage discount = 18% Retail price =

asked by wilton on May 2, 2014
17. ## Math

The volumes of soda in quart soda bottles are normally distributed with a mean of 32.3 oz and a standard deviation of 1.2 oz. What percentage of bottles contain less than 32 oz of soda?

asked by Deb on December 11, 2010
18. ## Chemistry Help!!!!

for each of the following pairs of elements, give the correct molecular formula, explain how you arrived at this answer( you may use the Bohr model notation, or the orbital model notation, or explain linguistically) and note whether the bonding is covalent

asked by John on March 26, 2012
19. ## Chemistry

consider 2 sample of nitrogen gas. sample 1 contains 1.5 mol of N2 and has a volume of 36.7L at 25C and 1 atm. sample 2 has a volume of 16.5L at 25C and 1 atm. calculate the number of moles of N2 in sample 2 do i use the pv= nrt equation? and do i only use

asked by Anonymous on June 9, 2010
20. ## physics

A coal-fired electrical generating plant has an efficiency of 38%. The temperature of the steam leaving the boiler is 550 °C. What percentage of the maximum possible efficiency does this plant obtain? (Assume the temperature of the environment is 20 °C)

asked by Salem on December 4, 2012
21. ## chemistry

In the chlorine titration of a solution prepared by the dissolution of 0.2110 g of commercial hypochlorite was spent 19.50 ML of sodium thiosulphate solution 0.1002 mol/L. Calculate the percentage of chlorine (35.45 g/mol) in this sample

asked by kelly on July 16, 2018
22. ## Managerial Finance

East Coast Yachts uses a small percentage of preferred stock as a source of financing. In calculating the ratios for the company, should preferred stock be included as part of the company’s total equity

asked by ta on May 16, 2012
23. ## Chemistry

a sample of a compound with a mass of 0.4168g is extracted from a plant. Decompostion of this sample produces 0.1667g of carbon, 0.2223g oxygen, and the remainder is hydrogen. What is the percentage compostion (by mass) of the compound?

asked by Cali on December 3, 2015
24. ## Physics

A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. A) What is the speed of the block after the collision? B) What percentage of the ball's initial energy is "lost"?

asked by Trevor on June 2, 2014
25. ## Statistics

We are working on pivot tables with grouping. I have no trouble creating a table with variables and totals however, I cannot figure out how I can include Relative Frequencies and Percentage frequencies in the same pivot table - as shown in the book. Thanks

asked by Shellie on August 29, 2009
26. ## Trigonometry

In 2010, the population of a country was 70 million and growing at a rate of 1.9% per year. assuming the percentage growth rate remains constant express the population P, as a function of t, the number of years after 2010.

asked by Jamie on January 16, 2013
27. ## Math

Consider the weighted voting system [75: 31, 29, 23, 16, 8, 7]. Find each: a. The total number of players b. The total number of votes c. The weight of P3 d. The minimum percentage of the votes needed to pass a motion 9rounded to the next whole percent)

asked by Anna on August 9, 2013
28. ## economics

If there has been a 10 percent increase in consumer income between two periods, what was the percentage change in the demand for foreign travel. The income elasticity for foreign travel is 1.93

asked by Mary on May 31, 2010
29. ## statistics

Given that the general population is normally distributed on a standard scale measuring math aptitude with Mean = 50 (s.d. = 10), approximately what percentage of the population has a math aptitude score between 40 and 60?

asked by Darren on March 3, 2013
30. ## Math Need Help

The price of an item changed form \$140 to \$100. Then later the price increase again from \$100 to \$140. Which of the two changes was larger in percentage in term and how much percent?

asked by Mai on July 27, 2016
31. ## Statistics

the average numbers of hours a cat sleep is approximately normally distributed with a mean of 15 hours and a standard deviation of 1.7 hours; what percentage of cats sleep between 13 and 18 hours

asked by Belinda on April 28, 2014
32. ## Statistics

Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches? 34.1% 84.0% 15.7% my answer was 13.6 13.6% is this correct 97.6%

asked by Jack on June 20, 2010
33. ## math

A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?

asked by Anonymous on July 5, 2013
34. ## STATISTICS

the percentage of adults who have at some point in their life been told that they have hypertension is 23.53%. If 8 adults are randomly selected, find the probability that between 2 and 4 of then inclusive have been told that they have hypertension

asked by amber on January 27, 2012
35. ## percents

A company gives raises once a year. Amir's present salary is \$12,000. His manager would like to raise his salary to \$84,000. What percentage raise would he be recieving.

asked by Odessa on October 20, 2008
36. ## Life science

A pure-breeding black coat cat was crossed with a hybrid black coat cat. (a)Represent the diagrammatically .(b)What percentage of the offspring

asked by Bandlalakhe Duma on April 22, 2015
37. ## Math

Jackie buys a basket for \$6, 2 pounds of apples for \$3.50 per pound, and 2 pounds of oranges for \$3.50 each per pound. The tax for the whole purchase is \$1. Express the tax as a percentage.

asked by The Devil Cat on February 14, 2018
38. ## MATH

At a party, married people came with their husbands or wives. if half the women and 1/6 of the men in the party were single, what percentage of the people in the room were married?

asked by MNHS_HELP on January 9, 2015
39. ## Chemistry

0.5g sample of bronze containing Zn is dissolved in 100ml of acid. An aliquot of 25ml requred 10.25ml of EDTA. What is the percentage of zinc in the bronze sample?

40. ## Statistics

A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?

asked by Anonymous on July 5, 2013
41. ## statistics

the ages of the members of a gym have a mean of 44 years and a standard deviation of 12 years. what can you conclude from Chebyshev's theorem about the percentage of gym members aged between 26 and 62?

asked by dianne on February 7, 2016
42. ## Chemistry

We're doing gas problems in chemsitry. I have no idea where to even begin on this problem: Air is 20% oxygen and 80% nitrogen. What is the mass of air in an automobile tire of 19.7 L and internal pressure of 46.7 PSI at 24 degrees celsius? (That pressure

asked by Avalon on March 30, 2010
43. ## math

A shop keper buy 40kg of fruits for #120. he sells 20kg at #5 per Kg, 10kg at #2 per kg and the remaining 5kg at 50kobo. calculate amount he realise from d sales .calculate total profit. calculate percentage on his outlay of #120

asked by opeoluwa on November 22, 2018
44. ## Chemistry

Excess lead (II) nitrate solution is added to 1.30 g of zinc powder and the mixture is stirred. When the reaction is finished the lead formed is filtered, dried and weighted. It has a mass of 3.31 g. What is the percentage yield of the lead? Pb(NO3)2 + Zn

asked by chem_cg on July 11, 2017
45. ## chemistry

The polarogram for 20ml solution that was 3.65 x 10^-3 M in cadmium (Cd2+) gave a wave for that ion with a diffusion current of 31.3microampere. Calculate the percentage change in concentration of the solution is the current in the limiting current region

46. ## Chemistry

What volume of nitrogen gas can be produced from he decomposition of 37.6 L of ammonia with both gases measured at 725 degree celsius and 5.05 pressure? In the reaction in 71 what total volume of gas at 667 celsius and 11.3 atm can be produced by the

asked by Grace Peterson on October 27, 2013
47. ## Chemistry

Hydrogen gas, H2, reacts with nitrogen gas, N2, to form ammonia gas, NH3, according to the equation 3H2(g)+N2(g)→2NH3(g) PArt 1: How many grams of NH3 can be produced from 3.26 mol of N2 and excess H2. Part 2: How many grams of H2 are needed to produce

asked by Rose on February 7, 2017
48. ## Physics

a) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in ?g/s. Express this quantity in b) For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day

asked by aj on June 9, 2017
49. ## Algebra

The selling prices of houses in a city during one year were normally ditributed with a mean of \$259,000 and a standard deviation of \$15,000. Which of the following is closest to the percentage of the homes that had a selling Price between \$244,000 and

asked by Jessica on September 23, 2014
50. ## Stats

At a major International Airport, 0.49 of the flights arrive on time. A sample of 12 flights is studied. What is the probability that more than 3 of them arrived on time? Write only a number as your answer. Round to 2 decimal places (for example 0.24). Do

asked by Semmy on October 13, 2015
51. ## Chemistry

A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected of the water at .930 atm. and 23.0 degrees C. What is the percentage of sodium bicarbonate in the original mixture?

52. ## Math

The edge of a cube was found to have a length of 50 cm with a possible error in measurement of 0.1 cm. Based on the measurement, you determine that the volume is 125,000 cm3. Use tangent line approximation to estimate the percentage error in volume.

asked by Mimi on December 29, 2014
53. ## statistics

A group of 50 teachers and school administrators attended a convention. If any two persons are picked at random, at least one of the two would be a teacher. From this information, what percentage of the people at the convention were teachers? Could someone

asked by Katia on June 13, 2012
54. ## statistics

Assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentages of scores less than 100 b. relative frequency of scores less than 120

asked by terry on July 19, 2010
55. ## Chemistry

A 1.00 g sample of limestone is allowed to react with 100 cm^3 of 0.200 mol/dm^3 HCl. The excess acid required 24.8 cm^3 of 0.100 mol/dm^3 NaOH solution. Calculate the percentage of calcium carbonate in the limestone

asked by Gary on July 10, 2016
56. ## Chemistry

When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.

asked by Shane on June 10, 2013
57. ## Chemistry

When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield.

asked by Shane on June 10, 2013
58. ## Chemistry

a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitat weighs 2.99g what percentage of silver is the coin?

asked by Sarah on October 29, 2012
59. ## Chemistry

a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitate weighs 2.99g what percentage of silver is in the coin?

60. ## chemistry

A 12.42 gram sample of a mixture of NaCl and CaCl2 is dissolved in water and all the chloride is precipitated as AgCl. If the AgCl precipitate has a mass of 31.70 grams. How do I find the mass percentage of each component in the original mixture?

asked by Anonymous on January 21, 2015
61. ## chemistry

25 ml of milk were titrated with a 0.124M KOH solution of potassium hydroxide. If 4.5 ml of KOH solution were required to reach the titration endpoint, with a percentage (% w / v) lactic acid present in the milk? (MM = 90.08g / mol)

asked by william on June 16, 2018
62. ## statistics

If a major Internet store wants to estimate the percentage of adult Internet shoppers in order to determine the maximum impact of Internet shoppers on its sales, what amount of the shoppers should be used as a sample?

asked by Trish R on June 21, 2010
63. ## statistics

A company produces batteries whose lifetimes are normally distributed with a mean of 100 hours. It is known that 90% of the batteries last at least 40 hours. (i). Estimate the standard deviation lifetime. (3 marks) (ii). What percentage of batteries will

asked by Ravi on April 26, 2013
64. ## statistics

It is estimated that amounts of money spent on gasoline by customers at their gas stations follows a normal distribution witha standard deviation of \$3. It was also found that 10% of all customers spent more than \$25. What percentage of customers spent

asked by Anonymous on February 16, 2012
65. ## 12 Chemistry

What is the molar enthalpy of combustion of magnesium? This was the lab question that I was asked to find after performing a lab based on Hess' law. I can't find anywhere in my notes how to calculate this, and the text book doesn't explain their steps

asked by Chase (sorry if this long) on March 29, 2008

A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original

asked by Jordan on December 3, 2008
67. ## Chemistry 101

10.0 grams of nitrogen is reacted with 10.0 grams of the element phosphorus under certain conditions to yield trinitrogen diphosphide. Answer these questions. 1). Write a balanced equation. 2). which reactant is limiting? In excess? 3). Theoretically, how

asked by Lilly on March 4, 2016
68. ## accounting

Pattillo Industries makes a product that sells for \$25 a unit. The product has a \$5 per unit variable cost and total fixed costs of \$9,000. At budgeted sales of 1,000 units, the margin of safety percentage is 45%, 55%, 64%, none of these

asked by Rudy on November 14, 2013
69. ## Chemistry

The decomposition of ehtane, C_2H_6, is a first-order reaction. It is found that it takes 212seconds to decompose 0.00839M C_2H_6 to 0.00768M. A. How long in minutes will it take to decompose ethane so that 27% remain B. What percentage of ethane is

asked by Kim on December 25, 2010
70. ## math

A (yearly) cash flow stream is x=(-40,10,10,10,10,10,10). The spot rates are (yearly in percentage) s=(5.0,5.3,5.6,5.8,6.0,6.1). Use the discount factors to determine the (net) present value of the stream. (I got a little confused here. Should I 1. use the

asked by Anonymous on August 19, 2014
71. ## Chemistry

A 1.85-g sample of a mixture of KCl and MgCl(subscript 2) is treated with excess AgNO(subscript 3) (aq). If 3.82 grams of AgCl(s) are obtained, then what is the percentage by mass of KCl in the original mixture. Can someone tell me what the balanced

asked by Jon on October 13, 2010
72. ## Managerial Economics

A company has developed the production function of Q=80L.5 K0.6 where L represents labor and K represents Capital. a. If L is increased by 2% with K unchanged, what is the resulting percentage change in output? b. Describe the nature of returns to scale

asked by Patty on August 2, 2014
73. ## home economics

Use the Expenditure Equation for GDP (GDP = C + 1 + G + XN). Using your research skills, find the values for each sector for the years 1929 and 1933. Determine the percentage change for the two years. Explain the drastic change and what this meant for the

asked by Anonymous on February 23, 2014
74. ## Economics Homework

Use the Expenditure Equation for GDP (GDP = C + 1 + G + XN). Using your research skills, find the values for each sector for the years 1929 and 1933. Determine the percentage change for the two years. Explain the drastic change and what this meant for the

asked by Miranda on July 8, 2010
75. ## math

A bookseller marks his books at an advance of 69% in actual cost of production.he allows a discount of 15% and also given a copy free for every dozen sold a time.what rate percentage profit does the bookseller make,if books are sold to 12? ( ANS 32.6? )

asked by kiran on May 30, 2017
76. ## Chemistry

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g) --> O2(g)+NO2(g) The rate law for this reaction is: rate=k[O3][NO] Given that k = 2.87 × 106 M–1·s–1 at a certain temperature,

asked by Ceamus Angelina on July 2, 2018
77. ## Chemistry

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g) --> O2(g)+NO2(g) The rate law for this reaction is: rate=k[O3][NO] Given that k = 2.87 × 106 M–1·s–1 at a certain temperature,

asked by Ceamus Angelina on July 2, 2018
78. ## Chemistry

A solution contains H2O2 in water. Complete decomposition of the H2O2 in 170 g of this solution yields 5.6 L of O2(g), measured at 0 oC and 101.325 kPa. What is the percentage by mass of H2O2 in this solution? Choose the closest answer. A 10% B 20% C 5.0%

asked by anon on May 18, 2016
79. ## math

Suppose x is a random variable with mean and standard deviation. If a large number of trials is observed, at least what percentage of these values is expected to lie beween mean-2(standard deviation) and mean + 2(standard deviation) could someone help me

asked by jake on April 9, 2009
80. ## chemistry

We can determine the content (%) of calcium in milk through complexometric analysis by titration with EDTA. If we weigh 0.50 g of milk powder and titrate with EDTA 0.010 mol/L. What percentage of Ca2+does the milk if expended EDTA was 13.6 ml?

asked by william on June 13, 2018
81. ## Physics

1. A worker pulls horizontally on a crate across a rough horizontal surface, causing it to move forward with constant velocity. Force A is the force exerted by the worker and force B is the force of friction due to the surface. What is the relationship

asked by Ams on October 19, 2018
82. ## chemistry

The percentage yield for the reaction PCL3+Cl2-->PCL5 is 83.2%. What mass of PCL5 is expected from the reaction of 73.7g of PCL3 with excess chlorine?

asked by Brennan on January 13, 2015
83. ## Statistics

Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches? (Points: 5) 34.1% 84.0% 15.7% 13.6% 97.6%

asked by alex on June 20, 2010
84. ## math

If 50ml of a 7.5% (w/v) sodium bicarbonate injection are added to 500ml of a5% dextrose injection , what is the percentage strength (w/v)of sodium bicarbonate in product?

asked by sara on June 22, 2014
85. ## Math

If you have a graph with the x-axis as the days of the month, and the y-axis as stock price.... Then, how to do you figure out the percentage drop in stock price for each week?

asked by Zac on April 19, 2009
86. ## math

What was the percentage increase in motor vehicle production in motor vehicle production in countries outside the united states from 1950 to 1997?

asked by stacy on February 10, 2007
87. ## MATHEMATICS

There are thrice as many girls as boys at a school. If 35% of the girls and 45% of the boys have already completed their holiday project, what percentage of the learners still needs to complete their project?

asked by SERIRI on July 24, 2016
88. ## mathematics

There are thrice as many girls as boys at a school. If 35% of the girls and 45% of the boys have already completed their holiday project, what percentage of the learners still needs to complete their project?

asked by edna on July 28, 2016
89. ## math

in a distribution of 160 values with a mean of 72,at least 120 fall within the interval 67-77. approximately what percentage of values should fall in the interval 62-82? use chebyshev's formula.

asked by ellen on June 28, 2011
90. ## maths

A solution whose volume is 80% liters is made up of 40% of water and 60% of alcohol,When x liters of water is added the percentage of alcohol drops to 40% Find X

asked by Eddypiller dreamer on April 18, 2017
91. ## Math 221

A chess club with 55 members is electing a new president. Ali received 33 votes. What percentage of the club members voted for Ali?

asked by Libby on July 7, 2014
92. ## Pre-Algebra

A chess club with 40 members is electing a new president. Lisa received 16 votes. What percentage of the club members voted for Lisa?

asked by Anonymous on September 18, 2016
93. ## statistics

I need to see the steps to figuring out this problem. 270 patients were given a placebo of those 270, 19 had headaches. What percentage of this placebo group reported headaches?

asked by Tara on February 18, 2012
94. ## Chemistry 101

This is the question 10.0 grams of nitrogen is reacted with 10.0 grams of the element phosphorus under certain conditions to yield trinitrogen diphosphide. Answer these questions. 1). Write a balanced equation. 2). which reactant is limiting? In excess?

asked by Lilly on March 4, 2016
95. ## stoichiometry

2. A feed ingredient gave the following percentage analysis moisture (16.0%), protein (18.0%), and fibers and minerals (66.0). If the moisture content were to be reduced by drying material in order to bring up the protein to 20.0%, what should be the final

asked by lecille gaudiano on February 16, 2016
96. ## chemistry (moles)

2.5g of a mixture of anhydrous BaOH and BaCl2 was dissolved in distilled water and made up to 250cm3. 20cm3 of this solution required 19cm3 of 0.1moldm3 of dilute nitric acid for complete reaction. Calculate the percentage by mass of BaCl2 present in the

asked by joseph on January 22, 2016
97. ## Analytical chemistry

The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if

asked by Sam on January 29, 2016
98. ## Statistics

Each year, thousands of college seniors take the Graduate Record Examination (GRE). Assume the scores are transformed so they have a mean of 600 and a standard deviation of 150. Furthermore, the scores are known to be normally distributed. Determine the

asked by Emily on October 9, 2011
99. ## Chemistry

A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture? I am all out of tries on the

asked by Jane on October 27, 2014
100. ## Physics

(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the

asked by Ally on June 25, 2012