1. chemistry

    A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmhg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure in torr?
  2. 2008 presidenta election

    Which state primaries award delegates in proportion to their percentage of the vote? How does it end up that Alaska has more delegates than Connecticut?
  3. Chemistry

    Express the concentration of a 0.0860 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.
  4. Math Quantitive Reasoning

    The amount of Jen's monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $12. What percentage of her phone bills are between $14 and $86?
  5. math

    Cassandra is repaying an installment loan of $3,500 with 20 equal monthly payments of $196 each. What is the annual percentage rate of the loan?
  6. statistics

    If the grades on a police entrance exam are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of students received grades of less than 115?
  7. chemistry

    given that thee density of a supplied vinegar solution in an experiment is 1.025g/ml, what is the percentage acetic acid found in the vinegar sample?
  8. chemistry

    FIND THE PERCENTAGE BY VOLUME COMPOSITION OF A VINEGAR SOLUTION CONTAINING 10cm (TO THE POWER OF 3) OF ACETIC ACID AND 190 (TO THE POWER OF 3)OF H2O
  9. Chemistry

    Express the concentration of a 0.0900 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.
  10. Math

    Find the annual percentage rate on a loan of $1,500 for 18 months if the loan requires $190 interest and is repaid monthly.
  11. chemistry

    By international agreement, the nautical mile is now defined as exactly 1852 meters. By what percentage does this current definition differ from the original definition?
  12. Chemistry

    No change of mass was observed when a definite amount of a mixture of KI and NaCl is converted to sulphate salts. What is the percentage composition of the mixture?
  13. Math

    2. Assuming your weekly gross earnings are $525, calculate your withholding tax using the wage bracket method and the percentage method.
  14. Math

    Compute the Annual Percentage Yield (APY) for the investment in the previous question. (Round APY to the nearest hundredths of a percent.)
  15. computers

    Which type of chart would best illustrate each department's sales as a percentage of the overall store sales? Answer a. area b. bar c. line d. pie
  16. Maths

    Shopkeeper sells his goods at 20% above the cost price. What will be the percentage profit he will earn if he discounts the price by 10% and then offer a seasonal discount of 5%?
  17. Math

    Scores on the GRE are normally distributed with a mean of 541 and a standard deviation of 89. Use the 68-95-99.7 rule to find the percentage of people who score between 363 and 541
  18. pharmacy calculations

    If 500gm of dextrose are dissolved in 600ml of water, with the final volume being 1000ml, what is the percentage strength of the dextrose in the solution?
  19. math

    Compute the markup for the following problem. Cost of article = $195 Retail price = $225 Percentage of markup (to the nearest tenth)=
  20. Math

    Question 11 of 20 5.0 Points The percentage analysis of changes of corresponding items in comparative financial statements is referred to as horizontal analysis. A. True B. Fals A
  21. Math

    You purchased a pair of shoes on sale for $46.75. The original price was marked as $55.00. Find what by percentage the shoes were reduced (ignoring tax).
  22. goverment

    which region of the nation receives the highest percentage of its revenues form the federal goernment> a. south b. northeast c. northeast e. west
  23. physics

    Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface.
  24. College algebra

    The radioactive element has a half-life of about 28 years and sometimes contaminates the soil. After 47 years, what percentage of a sample of the elements remain?
  25. Chem

    Express the concentration of a 0.0700 M aqueous solution of fluoride, F-, in mass percentage and in part per million. Assume the density of the solution is 1.00 g/mL.
  26. Algebra (Normal Distribution)

    The mean of a normally distributed data set is 12, and the standard deviation is 2. ___% of the data points lies between 8 and 16. Find the percentage
  27. Calculus Help

    Let P(t) be the percentage of Americans under the age of 18 at time t. The table gives values of this function in census years from 1950 to 2000. How would it be possible to get more accurate values for P'(t).
  28. statistics

    Assuming the resting heart rates for a sample of individuals are normal distibuted with a mean of 70 and a standard deviation of 15. Waht percentage of rates less than 70
  29. Math

    I need to change this number to a percentage, rounded to the nearest tenth. 1350-1010/1010=.336633663 would the answer be 3%? this one is confusing to me for some reason
  30. math

    hello, im in 3rd grade and i need help on these 2 questions. 1) What is 3 as a percentage of 10? 2) The nth term rule for a sequence is 2n+3. Write the first 4 terms in this sequence. is question 1 30% thanks if you reply
  31. Chemìstry

    The following two solutions were combined and mixed well: 150.00 mL of a 3.500 M iron(¡¡¡) nitrate solution and 760.00mL of a 1.600M magnesium nitrate solution. 20.00mL of the final solution was transferred with a pipette into an empty 250.00mL
  32. Chemistry

    The following two solutions were combined and mixed well: 150.00 mL of a 3.500 M iron(¡¡¡) nitrate solution and 760.00mL of a 1.600M magnesium nitrate solution. 20.00mL of the final solution was transferred with a pipette into an empty 250.00mL
  33. Chemistry

    20.When black gunpowder explodes, potassium nitrate, carbon, and sulfur react with each other to form nitrogen, carbon dioxide, and potassium sulfide. If thee original mixture contains 50.0 g of potassium nitrate, what is the total volume of the gases
  34. science

    A mixture of nitrogen gas, hydrogen gas and ammonia gas reacts by: N2(g) + 3H2(g) = 2NH3(g) If the total pressure in the reaction vessel is 50.0 atm ans the equilibrium mixture contains by volume: N2= 96.143% H2= 0.3506% NH3= 3.506% what is the equilibrium
  35. Chemistry

    im learning the general concepts of how atoms react etc... and i was struggling on the concept of diatomic molecules and how they work. For example, i understand how halogens would be diatomic, (through reacting with the other atom by sharing one
  36. chem PLEASE HELP

    A Nitrox II gas mixture for scuba diving contains oxygen gas at 50atm and nitrogen gas at 98atm . What is the total pressure, in atm, of the scuba gas mixture?
  37. Chemistry

    Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
  38. Chemistry

    give the balanced equation for: Liquid nitric acid decomposes to reddish brown nitrogen dioxide gas, liquid water, and oxygen gas. the equation i got was HNO3 --> NO2+ H2O+ O2 is that right? i haven't balanced it yet
  39. Chemistry

    Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
  40. Chemistry

    Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
  41. Chemistry

    Compound X contains only carbon, hydrogen, nitrogen, and chlorine. When 1.00 g of X is dissolved in water and allowed to react with excess silver nitrate, AgNO3, all the chlorine in X reacts and 1.95 g of solid AgCl is formed. When 1.00 g of X undergoes
  42. Chemistry

    When heated to 350. ∘C at 0.950 atm, ammonium nitrate decomposes to produce nitrogen, water, and oxygen gases: 2NH4NO3(s)→Δ2N2(g)+4H2O(g)+O2(g) Using the ideal gas law equation, calculate the volume, in liters, of water vapor produced when
  43. chemistry

    What is the partial pressure of CO2 (torr)in exhaled breathe at 37 degree C. if the partial pressure of O2 is 116 (torr) and that of Nitrogen is 569 (torr). Assume atmospheric pressure is 1 atm. kindly help me with this problem
  44. chemistry

    assuming the valencies of hydrogen nitrogen and carbon are 1,3,and 4. i need to draw a structural formulae for hydrogen cyanide and cyanogen that are consistant with these values H(triple bond)C-N N(triple bond)C-C(triple bond)N
  45. chemistry

    Write the rate equation for the relative disappearance of dinitrogen pentoxide. Write the rate equations for the relative appearance of nitrogen dioxide and oxygen gas. When writing the equations, remember to think about how many NO2 and O2 molecules are
  46. Chemistry

    6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ------------------------------------------- I tried dimensional analysis in a couple
  47. Chem II - Equilibrium

    A 2.00 mol sample of nitrogen dioxide was placed in an 80.0L vessel. At 200 degrees C, the nigrogen dioxide was 6.0% decomposed according to the equation: 2NO2 in equilibrium 2NO + O2 Calculate the value of Kc for this reaction at 200 degrees C. I have
  48. chemistry

    The diving atmosphere used by the U.S. Navy in its undersea Sea-Lab experiments consisted of 0.036 mole fraction O2 and 0.058 mole fraction N2, with helium (He) making up the remainder. What are the masses of nitrogen, oxygen, and helium in a 7.22-g sample
  49. chemistry

    When 25 mL of C2H5OH (density 0.80 g.cm-3) is dissolved in water to prepare a 250 mL solution, the density of the solution was found to be 0.950 g.cm-3. Calculate a. Molarity of pure ethanol; b. Molarity of ethanol in the final solution; c. Volume of the
  50. Chemistry:normal notation plz help

    Using the normal notation of quantum number find the element which has the following value of quantum number n=3 l=2 m=2 s=+1/2 (a):potassuim (b):nitrogen (c):sodium (d):scandium
  51. Chemistry

    Ammonia is formed by reacting nitrogen and hydrogen gases. How many liters of ammonia gas is formed from 13.7 L of hydrogen gas at 93C and pressure of 40 kPa?
  52. Chemistry

    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
  53. chemistry

    In the presence of a tungsten catalyst at high temperature, the decomposition of ammonia to nitrogen and hydrogen is a zero order process. If the rate constant at a particular temperature us 3.7x10^-6 mol. How long will it take for an ammonia concentration
  54. The Chemistry of Life Quiz // Just Answers please

    Which of the following are considered macromolecules? Select all that apply. (2 points) nitrogen lipids proteins*** carbon*** Which property allows water to stick to glass? (1 point) cohesion**** suspension adhesion solution How many valence electrons does
  55. Chemistry Lab

    Penicillin is an important antibiotic isolated from a type of mold. If you have 0.0468 g Penicillin, C14H20N2SO4MW = 31239 gmol , answer the following questions. A. How many moles of Penicillin do you have? B. What is the number of moles of nitrogen that
  56. Business Finance

    Cassandra is repaying an installment loan of $3500 with 20 equal monthly payments of $196 each. What is the annual percentage rate of the loan?
  57. Business Math

    Compute the Annual Percentage Yield (APY) for the investment in the previous question. (Round APY to the nearest hundredths of a percent.)
  58. Chemistry

    What is the percentage yield for a reaction if you predict the formation of 21 grams of C6H12 and actually recomvered only 3.8 grams? is the answer 18% 3.8g/21g x 100% pls verify.
  59. chemistry

    in an experiment, 2.50g of salicylic acid is reacted with 10.31g of methanol. the yield of methyl salicylate, C8H8O3, is 1.27g. what is the percentage yield?
  60. physics

    A 7.5 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest. What percentage of the initial kinetic energy of the system is lost during the collision?
  61. Math

    If 72% of Americans have straight hair, 76% have brown eyes, 87% are high school graduates, and 88% are less than 6 feet tall, what is the minimum percentage of Americans who have all four attributes?
  62. statistics

    mean cholesterol is 175mg/dl..standard deviation =20mg/dl assume approx normal distribution ..is varied. what percentage has a cholesterol level above 155mg/dl?
  63. Physics

    Devise the series or parallel combination of 2 capacitances from the E6 series that gives the closest match to the capacitance 1.14 μF. Indicate the percentage error between the desired value and the value you obtain.
  64. statistics

    suppose that iq scores have a bell-shaped distribution with a mean of 97 and a standard deviation of 17. using the empirical rule, what percentage of iq scores are greater than 46? please do not round your answer.
  65. Business Math

    Cassandra is repaying an installment loan of $3,500 with 20 equal monthly payments of $196 each. what is the annual percentage rate of the loan?
  66. Math

    Use the 68-95-99.7 rule to solve the problem. - The amount of Jen's monthly phone bill is normally distributed with a mean of $53 and a standard deviation of $11. What percentage of her phone bills are between $20 and $86?
  67. Chemistry

    A 3.000gram sample of a hydrate compound containing Co, C2O4, and H2O was combusted to give 1.316g of Co3O4. What is the percentage of Cobalt in the original sample?
  68. chemistry

    When 3.00 moles of sodium are reacted with large amounts of chlorine gas 145.8 g of sodium chloride are produced determine percentage yield
  69. math

    what was the percentage increase in the age 75+ population of europe from 1970 (22,762) to 1995 (38,139) PercentIncreas= (38139-22762)/22762 *100
  70. stats

    The incomes of trainees at a local mill are normally distributed with a mean of $1100 and a standard deviation $150. What percentage of trainees earn less than $900 a month?
  71. word problem

    a computer company gives a discount of 10% on a new piece of software.If it makes a 40% profit what percentage does the marked price exceed the cost price
  72. programming

    Grades are assigned on the standard 90, 80, 70, 60 scale. You are to write an algorithm which will receive a student name and a percentage grade and display the letter grade to be awarded
  73. Business math

    find the annual percentage rate on a loan of $1,500 for 18months if the loan requires $190 interest and is repaid monthly.
  74. math

    What percentage interest rate is a loan that charges one hundred dollars in simple annual interest over 5 years on a one thousand dollar balance?
  75. finance

    Calculate the rate of interest compounded yearly (j) equivalent to 8% pa compounded quarterly. Give your answer as a percentage per annum to 3 decimal places.
  76. physic

    1) A 2 . 3 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest. What percentage of the initial kinetic energy of the system is lost during the collision?
  77. statistics

    Suppose a college's SAT scores are normally distributed with mean 1000 and standard deviation 1 for students above 1200. What percentage of students is eligible for scholarships
  78. math

    The percentage of working mothers y can be modeled by the equation y=0.0102x + 0.644 where x is the number of years since 1990. In what year will 90% of mothers be in the labor force?
  79. eng, math, science, geography

    The marked price of a book is double that of its cost. In a sale, what percentage discount was given if the profit made was 20% of the cost?
  80. Bio

    Given an allele frequency of o.91 for a hypothetical red allele (bead), the percentage of blue alleles residing in the heterozygotes would be? a) 89% b) 90% c) 91% d) 92% e)93% i don't even know how to approach this question
  81. Chemistry

    An organic compound on analysis gives the following percentage composition of elements present. Carbon 61.85%,hydrogen 10.50% and oxygen 27.65%.determine the empirical formula of the compound.(C=12,H=1,O=16)
  82. chem

    for a combination reaction, it was calculated that 7.59g of A would exactly react with 4.88g of B. these amounts were reacted, and 9.04g of product was isolated. what was the percentage yield of reaction??
  83. Statistics

    What is the percentage of immigrants living here in the U.S. legally? Of these people, how many are naturalized? I've tried looking this up, but either the article was made without the full 2012 census or it talked about illegal immigrants.
  84. Math

    At the end of the course David averaged a 90% on Tests; 80% on Quizzes; 60% on Quick Checks; 90% on Discussions; 100% on Participation and 95% on Sample Work. What would be his final percentage to the nearest tenth and please show how you got your answer!
  85. Statistics

    Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0.06; confidence level 90% ^p and ^q unknown n= (round up to the nearest integer)
  86. Math 120

    The results of a certain medical test are normally distributed with a mean of 128 and a standard deviation of 19. ​(A score above 140 is considered​ unhealthy.) Use the given table to find the percentage of people with readings below 137.
  87. statistics

    Car seat belts are tested for strength, and it is found the results are normally distributed with a mean of 2400 lb and a standard deviation of 400 lb. Using the 68-95-99.7 rule, find the percentage of scores between 1600 lb and 3200 lb.
  88. chemistry

    The chloride at 0, 272g of a sample was precipitated by the addition of 50.00 ml of AgNO3 0.1030 M. The titration of excess silver, it has spent 8.65 ml of KSCN 0.1260 M. Express the outcome of this analysis Percentage of MgCl2
  89. maths

    If the face value of a 91-day Treasury Bill is £100000 and it is issued at a discount of £1300, what is the annual interest rate (yield) that the purchaser receives (expressed as a percentage to 2 decimal places)?
  90. Math

    If the growth rate of a population is 1.5% how long will it take that country to double? 46 years. Use the above question to help answer this. In 2002 16.4 million babies were born what is the birthrate as a percentage and as per 1000 births? How do I
  91. finance

    Here are data on $1,000 par value bonds issued by Microsoft, Ford, and Xerox at the end of 2008. Assume you are thinking about buying these bonds as of January 2009. Answer the following questions: a.) Calculate the values of the bonds if your required
  92. Chemistry

    A rubber balloon was filled with helium at 25˚C and placed in a beaker of liquid nitrogen at -196˚C. The volume of the cold helium was 15 cm3 Assuming ideal gas behavior and isobaric conditions, what was the volume of the helium at 25˚C?
  93. Chemistry

    If I have 0.17g of Mg and 0.10g of O, and I am asked to find the empirical formula for magnesium oxide, is the following the right way to go about it? Convert g-> mol 0.17g=0.01mol Mg 0.10g=0.01mol O Divide by smallest mole amt. (0.01mol)
  94. chemistry

    What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than
  95. chemistry

    What is formed at the anode and cathode when the following solutions are electrolysed? sodium iodide copper II chloride sodium sulphate NaOH HCl magnesium nitrate also is this true: if the metal in the compound is higher in the reactivity series than
  96. Chem 27

    An antacid tablet weighing 3.084 g was dissolved and diluted to 100.0 mL in a volumetric flask. A 25.00-mL aliquot was removed and treated with sufficient 8-hydroxyquinoline to precipitate all of the aluminum and magnesium. After proper collection and
  97. Prob:

    Each month, a sales manager classi¯es his sale people as low, medium, or high producers. There is a 20% chance that a low producer will become a medium producer the following month, and a 5% chance that a low producer will become a high producer. A medium
  98. Chemistry 2

    Pure nitrosyl bromide, NOBr at 0.762 M is placed into a sealed vessel and heated up to 400 K. When the system reaches equilibrium, it is found that 65.1% of the nitrosyl bromide has decomposed to nitrogen monoxide and bromine. Determine Kc for this
  99. chemistry

    Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3 NO2(g) + H2O(ℓ) −→ 2 HNO3(ℓ) + NO(g) If 900 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the same
  100. College Chemistry 104

    Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb.