1. Chemistry

    1)The chemical formula for aspirin is C9H8O4. What is the mass of 0.40 mol of aspirin? How would I find this? 2)The gram molecular mass of oxygen is 16.0 g right? 3)How would I find the mass, in grams, of 3.01 x 10^23 molecules of water? 1. Add the atomic

    asked by anonymous on July 31, 2007
  2. chemistry

    You take an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen) with a mass of 1.00 g, combust it under an oxygen atmosphere, and collect 2.20 g of carbon dioxide and 0.400 g water. The molar mass of aspirin is between 170 and 190

    asked by Anonymous on February 25, 2014
  3. Chemistry

    A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the metal M [Answer: _____

    asked by . on October 29, 2009
  4. Physics

    How many grams of water (H_2O) have the same number of oxygen atoms as 1.0 (mol} of oxygen gas? atomic mass of H is 1 and O is 16, so H2O has a molar mass of 18. Oxygen gas is O2, with a molar mass of 32. So 1.0 mole of oxygen gas has 6.02x10^23 molecules

    asked by ana on November 18, 2009
  5. chemistry

    A compound with the percent composition shown below has a molar mass of 60.10g/mol. Find its molecular formula: C, 39.97% H, 13.41% N, 46.62%

    asked by jay on February 15, 2013
  6. Science/ Chemistry

    When 0.422 g of phosphorus is burned, 0.967 g of a white oxide (a compound of phosphorus and oxygen) is obtained. a. Determine the empirical formula of the oxide. So for the empirical Formula I got P_2O_5 now it wants me to Write a balanced equation for

    asked by James on September 22, 2013
  7. Chemistry

    A compound with the molar mass of approximately 142 g/mol has the composition 50.7% C, 9.9% H, and 39.4% N. What is its molecular formula? Element order CxHyNz.

    asked by Jane on June 11, 2020
  8. Chemistry

    Compound has a molar mass of 283.89 g.mol^-1 and the following composition: Phosphorus: 43.64% Oxygen: 56.36% Write the molecular formula of X.

    asked by Kai on December 17, 2018
  9. Chemistry

    A compound is found to contain 50.05 % sulfur and 49.95 % oxygen by mass. What is the simplest (empirical) formula for this compound? They said to assume that it is 100 grams. I found the molar mass. S- 32.06 0-16.00 But now I don't know what to do. Please

    asked by Jordan on August 27, 2015
  10. Chemistry 11

    A hydrate of zinc chlorate, Zn(ClO3)2 .xH2O(s) contains 21.5% zinc by mass. Find the value of x. What I've done: Molar mass of Zn: 65.409 g/mol Molar mass of Cl: 2*35.453 =70.906 g/mol Molar mass of O: 6*15.9994 =95.9964 g/mol Total molar mass of

    asked by Anonymous on November 13, 2014
  11. Chemistry

    What is the empirical formula for a compound of sodium and oxygen that contains 59% by mass? I am guessing it would be NaO because the molar mass of Na is 22.99 g/mol and 22.99 g/mol Na / 22.99 + 16 is approx 59%. Just wanted to make sure that is correct.

    asked by Anonymous on May 7, 2017
  12. Chemistry

    A 2.612 g sample of a copper oxide, when heated in a stream of H2 gas, yields .592 g H20. What is the formula of the copper oxide? Again, I need help with this problem. Answer = CuO Ok nvm.. i got it. Set up the reaction as best we can surmise at the

    asked by Laura on August 25, 2005
  13. chemistry

    Calculate the theoretical percentage of water present in cobalt (II) chloride hexahydrate, given that the molar mass is 237.93 g/mol and the molar mass of water in the compound is 108.12 g/mol. Question 8 options: 220% 50.5% 6% 45.4%

    asked by Tia on October 29, 2014
  14. smk lutong

    A compound consists only of carbon, hydrogen, nitrogen, and oxygen. Combustion of 10.68 g of the compound produced 16.01 g carbon dioxide and 4.37 g of water. the molsr mass of the compound is 176.1 g/mol. what are the empiricaland molecular formulas of

    asked by nadeen on September 16, 2013
  15. science chemistry

    A basic amino acid,arginine,has a molar mass of 174g.mol^-1.it has the following percentage composition:41,38% carbon, 18,39% of oxygen,32,18% of nitrogen and 8,O5% of Hydrogen.determine the molecular formular of arginine

    asked by bob on June 14, 2015
  16. physics problem!!

    If the water molecules in 5.70 g of water (H2O) were distributed uniformly over the surface of the Earth, how many such molecules would there be on 1.40 cm2 of the Earth's surface? -Molar mass Hydrogen gas(H2)=2.02 g/mol -Molar mass Oxygen gas (O2) = 32.0

    asked by boom on April 9, 2013
  17. CHEMISTRY

    A compound which contains hydrogen, oxygen, carbon only has molar mass of about 85 g/mol. When 0.43 g of the compound is burned in excess of oxyfen, 1.10 g of CO2 and 0.45 g of H2O are formed. Find the molecular formula and the empirical formula of the

    asked by Clive Lodnyx on July 18, 2016
  18. Science

    i need a bit of help finding out how to do this problem. just tell me how and ill take it from there. Q.A compound containing carbon, hydrogen, and Oxygen is found to be 40% carbon and 6.7% hydrogen by mass. the molar mass of this compound is between 115 g

    asked by Marty Mc Fly on November 12, 2017
  19. Chem

    i need a bit of help finding out how to do this problem. just tell me how and ill take it from there. Q.A compound containing carbon, hydrogen, and Oxygen is found to be 40% carbon and 6.7% hydrogen by mass. the molar mass of this compound is between 115 g

    asked by ricky bobby martin on November 12, 2017
  20. Chemistry- DrBob222

    I completed this question like you told me to. Are the answers correct? Is my method for finding the molecular formula correct? 2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass

    asked by Ava on October 22, 2013
  21. chemistry

    1. when sodium is combined with water, sodium hydroxide and hydrogen gas are produced. How many moles of sodium do you need to make 4.0 mol of hydrogen gas? 2.when aluminium reacts with sulfuric acid, aluminium sulfate and hydrogen gas are produced. How

    asked by Kelcye on April 29, 2010
  22. Chemistry

    The mineral cassiterite is a compound of tin and oxygen. Chemical analysis of cassiterite shows that the mass percentages of tin, Sn, and oxygen, O, are 78.8% and 21.2%, respectively. Determine the formula of this compound. I found the molar mass and

    asked by Jordan on August 30, 2015
  23. chemistry

    If a compound consists of 41.39 % carbon, 3.47 % hydrogen and 55.14 % oxygen what is the molecular formula if the molar mass is 116.07 g/mol?

    asked by lynda on June 5, 2010
  24. Chemistry

    The molar mass of a compound is 92 g/mol. What is the molecular formula for a sample containing 0.606g Nitrogen and 1.390g Oxygen?

    asked by Salt on March 21, 2017
  25. CHemistry....Please help

    1.SOLUBILITY: At 25C, the molar solubility of calcium phosphate in water is 1.1*10^{-7}M. Calculate the solubility in grams per liter. I m not sure how to convert M to g/L MOLAR MASS OF COLLIGATIVE PROPERTIES: 2.tert-Butyl alcohol is a solvent with a Kf of

    asked by Saira on January 24, 2009
  26. Chemistry

    A- 50.0 g of H2SO4 react with 75.0 g of NaOH. Identify the limiting and excess reactants. How many grams of Na2SO4 will be formed? B- A chemist burns 160.0 g of aluminum in 200.0 g of oxygen. She produces 275.0 g of aluminum oxide. Which is the limiting

    asked by Jess on February 24, 2020
  27. chemistry

    an organic compound contains C , H and O. in one combustion analysis, 10.71 g of this compound yields 6.41 g of H2O and 15.72 g of CO2. Calculate the number of carbon atoms in this organic compound if the molar mass of the compound is 146 g/mol

    asked by aimi on July 6, 2019
  28. chemistry

    How much does 1 molecule of bromine weigh? I know the atomic mass for bromine is 79.90 g but I do not know how to use it to figure out the weight of the molecule. The given answer is 2.654x10^-22 but I do not know how to get there. First, the molecule of

    asked by Carter on January 10, 2007
  29. chemistry

    I'm stumped again :( the question is - A gas sprayed from an aerosol can effuses 5.06 times slower than oxygen.If the molar mass of oxygen is 32.g/mol, what is the molar mass of the unknown gas? I don't know if I am doing the ideal gas law or grahams law

    asked by hellogoodbie on January 11, 2010
  30. chemistry

    A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. What is the molecular formula?

    asked by w on January 20, 2010
  31. Chemistry

    A 1.50-g mixture of the solid salts Na2SO4(molar mass 142.04 g/mol) and Pb(NO3)2(molar mass 331.20 g/mol) forms an aqueous solution with the precipitation of PbSO4 molar mass 303.26 g mol The precipitate was filtered and dried, and its mass was determined

    asked by Anwa on March 20, 2017
  32. AP CHEM FULL ?

    This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

    asked by Sam on December 2, 2006
  33. Chemistry

    A 2.20 g-sample of a compound containing carbon, hydrogen, and oxygen is burned and it produces 4.61 g CO2 and 0.94 g H2O. What is the empirical formula of this compound? (i.e., C2H4O) I found the mass of Carbon (4.61/44g)*(1 mol C/1 mol CO2)=.1047 I found

    asked by JORDAN on September 8, 2015
  34. General Chemistry

    An unknown compound has a formula of CxHyOz. You burn 0.1523 g of the compound and isolate 0.3718 g of CO2, and 0.1522 g of H2O. What is the empirical formula of the compound? If the molar mass is 72.1 g/mol what is the molecular formula?

    asked by Jashmid on December 8, 2010
  35. Chemistry

    I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

    asked by Matthew on February 20, 2012
  36. Chemistry

    I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

    asked by Matthew on February 20, 2012
  37. Chemistry 11

    Find the percent composition of a compound containing sodium and chlorine if 24.34g of the compound contains 13.45g of sodium. My work: Molar mass of NaCl: MNa +MCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol Percent composition of Na: 22.99 g/mol / 58.44

    asked by Christina on November 12, 2014
  38. Chemistry

    A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the metal M [Answer: _____

    asked by . on October 22, 2009
  39. Chemistry

    I did the work, but I need help checking it... A compound contains 83.24% by mass carbon. Calculate the molar mass of the compound if it contains 5 moles of carbon per mole of compound. This was my process: I took 100g of compound and found that there are

    asked by Kyle on January 26, 2012
  40. Chemistry

    112.00g of nitrogen gas is reacted with an excess or abundant amount of oxygen gas. The single product, a gas, is determined to have a mass of 431.92 g. Additional experiments showed that the product consisted of 2.0 moles. a) how many grams of oxygen

    asked by Maria on December 2, 2015
  41. chemistry

    I have a chemical composition of As2O3. How do I calculate the mass of oxygen that combines with 1 mol of arsenic to form the oxide of arsenic? How do I use this to obtain the empirical formula of the oxide? That IS the empirical formula of the compound.

    asked by bex on February 27, 2007
  42. Science

    1.Empirical formula P 2 O 5 , Experimentation shows that the molar mass of this compound 283.89g / (mol) . What is the compaund's molecular formula?

    asked by jj on December 10, 2019
  43. CHEM HELP! (Check work)

    H3CA is a vitally important intemediate in the metabolism of carbohydrates. The compound is widely distributed in plant and animal tissues and fluids. H3CA is a tiprotric acid, ie, it requires three moles of NaOH to fully neutralize one mole of H3CA. a.)

    asked by Morgan on September 12, 2017
  44. Chemistry

    Maleic acid is an organic compound composed of 41.39% C, 3.47% H, and the rest oxygen. If 0.271 mol of maleic acid has a mass of 31.4 g, what are the empirical and molecular formulas of maleic acid? My work: C: 41.39 g x (1 mol/12.01 g) = 3.44629 = 1 H:

    asked by Anonymous on April 15, 2010
  45. chemistry

    A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound

    asked by Anna King on February 3, 2012
  46. chemistry

    A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound

    asked by Anna King on February 5, 2012
  47. Chemistry

    Hi Im reposting incase my original post doesn't get read. Please see bottom for additional info that I need help getting verified. Many thanks Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure

    asked by Helpme on October 16, 2011
  48. chemistry/help

    1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus

    asked by nick on February 12, 2012
  49. chemistry/check please

    1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus

    asked by nick on February 12, 2012
  50. chemistry--help

    a compound contains 63.15% Carbon, 5.30% hydrogen, 31.55% oxygen. Its molar mass is 152.14 g/mol. determine the empirical and molecular formula. I get the empirical formula to be C8H803 is it right because it is not fitting the molecular formula because

    asked by amy on February 10, 2011
  51. Chemistry

    An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% Carbon and 5.30% H. The molar mass is determined by measuring the freezing-point depression of an aqueous solution. A freezing

    asked by James on February 24, 2015
  52. chemistry

    which of the following compounds contains the lowest percentage by mass of nitrogen? 1) NH4NO3 2) (NH4)2 SO4 3) NaNO3 4) NH3 can someone please help me??what method should i use?how do i do this? Find the molar mass of each compound by adding the molar

    asked by Emma on May 27, 2007
  53. Science

    The combustion of a compound which contains only C and H yields 2.58 g of CO2 and 0.53 g of H2O. What is the empirical formula of the compound? Molar mass of CO2= 44.01 Molar mass of H20= 18.01 2.58g/44.01=0.586 mol CO2 .53g/18.01=.0294 mol H2O I Don't

    asked by Jordan on August 19, 2015
  54. Chemistry

    A 24.3g sample of a compound XO2 contains 3.365 x 10^23 oxygen atoms. Determine the molar mass in g/mol of the element X. Show your work.

    asked by Adalaide on August 18, 2013
  55. chemistry

    A 250.0 mL sample of an aqueous solution at 25 degrees Celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? a.) 237 g/mol b.) 484 g/mol c.)

    asked by Bru on October 2, 2012
  56. Chemistry

    When 23.18 g of element A react completely with 48.08 g of E, compound A2E is formed. When 11.70 g of A react with 22.57 g of G, compound AG is formed. If elements E and G react to form EG3, what mass in grams of G is required to react with 12.97 g of E?

    asked by AJ on January 14, 2007
  57. Chemistry

    Determine the mass of a nonvolatile, nonionizing compound that must be added to 4.68 kg of water to lower the freezing point to 98.70oC. The molar mass of the compound is 50.0 g/mol and the Kf for water is 1.86oC kg/mol. Ignore significant figures for this

    asked by renee on February 22, 2012
  58. CHEM

    A gaseous hydrocarbon (an organic compound consisting of C & H) weighing 0.232g occupies a volume of 102mL at 23 degrees Celcius and 749mmHg. Calculate the molar mass and identify the compound. The compound is: a)C2H4 b)C3H6 c)C4H8 d)C5H10 e)C6H12 How is

    asked by K on December 13, 2006
  59. Chemistry

    Is the molar mass of SiO2 60 g/mol (I took the molar mass of Silicon-28, and added Oxygen's atmoic mass-16 and doubled it since it's diatomic). Thanks for checking my work.

    asked by Narasaq on June 2, 2009
  60. Chemistry

    Part 1: Find the % by mass of each element in camphor (C10H20O). Step 1: Find the atomic mass of each element in the molecule. Atomic Mass of C: 12.0107 Atomic Mass of H: 1.00794 Atomic Mass of O: 15.9994 Step 2: Find the mass combination of each element.

    asked by Chelsea on September 21, 2015
  61. College Chemistry 3

    Find the empirical Formula of a compound that is 30.4% nitrogen by mass, and consists of only nitrogen and oxygen. What is its molecular formula if its molar mass is 92g/mol?

    asked by Ernesto on August 15, 2012
  62. chemistry

    lactic acid is the avid responsible for the sour test in spit milk. on the basis of combustion analysis, it's percentage composition by mass is 40.00% carbon, 6.71%hydrogen and x% oxygen. a. Calculate the empirical formula of lactic acid b. The molar mass

    asked by amy on March 31, 2017
  63. math

    In order for the percent composition of a compound to be calculated, the molar mass of the compound and the chemical formula must be determined. True False I say true

    asked by shana on November 9, 2012
  64. chemistry

    Calculate the formula of a compound which has composition. MaMagnesium 9.8%,sulphur 13%, oxygen 26%,water of crystallization 51%. (Mg=24,S=32,O=16,H2O=18g/mol)

    asked by furry on November 28, 2016
  65. AP Chemistry

    An organic compound was synthesized and found to contain only C, H, N, O, and Cl. It was observed that when .150g sample of the compound was burned, it produced .138g of CO2 and .0566g of H2O. All the Nitrogen in a different .200g sample of the compound

    asked by Monique on September 15, 2009
  66. Chemistry

    If the heat of combustion for a specific compound is -1080.0 kJ/mol and its molar mass is 58.29 g/mol, how many grams of this compound must you burn to release 300.60kJ of heat?

    asked by Patricia on October 29, 2013
  67. Chemistry (balance)

    if the heat of combustion for a specific compound is -1320.0 KJ/mol and its molar mass is 67.53 g/mol how many grams of this compound must you burn to release 791.60 kj of heat

    asked by Jacob on August 20, 2012
  68. chem

    If the heat of combustion for a specific compound is -1160.0 kJ/mol and its molar mass is 90.75 g/mol, how many grams of this compound must you burn to release 823.00 kJ of heat?

    asked by rachel on March 20, 2018
  69. chemistry

    If the heat of combustion for a specific compound is -1310.0 kJ/mol and its molar mass is 75.45 g/mol, how many grams of this compound must you burn to release 708.60 kJ of heat?

    asked by :) on October 21, 2012
  70. Chem

    If the heat of combustion for a specific compound is -1170.0 kJ/mol and its molar mass is 42.75 g/mol, how many grams of this compound must you burn to release 191.90 kJ of heat?

    asked by Anonymous on July 13, 2014
  71. chemistry

    If the heat of combustion for a specific compound is -1460.0 kJ/mol and its molar mass is 55.75 g/mol, how many grams of this compound must you burn to release 900.20 kJ of heat?

    asked by catey on April 5, 2012
  72. Chemistry

    If the heat of combustion for a specific compound is -1010.0 kJ/mol and its molar mass is 46.03 g/mol, how many grams of this compound must you burn to release 388.00 kJ of heat?

    asked by Anonymous on March 27, 2013
  73. chemistry

    If the heat of combustion for a specific compound is -1180.0 kJ/mol and its molar mass is 40.91 g/mol, how many grams of this compound must you burn to release 114.50 kJ of heat?

    asked by anon on October 28, 2016
  74. Chemistry

    If the heat of combustion for a specific compound is -1250.0 kJ/mol and its molar mass is 35.39 g/mol, how many grams of this compound must you burn to release 352.40 kJ of heat?

    asked by Robert on April 11, 2016
  75. Chemistry

    If the heat of combustion for a specific compound is -1320.0 kJ/mol and its molar mass is 92.41 g/mol, how many grams of this compound must you burn to release 544.30 kJ of heat?

    asked by Anonymous on October 9, 2012
  76. Chemistry

    I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

    asked by Lina on January 16, 2016
  77. Chemistry Really Confused!!

    'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen.

    asked by Lina on January 16, 2016
  78. Chemisty - Colligative properties/freezing point

    QUESTION: How do you determine the molar mass of the unknown, nonelectrolyte compound for each trial? This is for a lab. My data is: freezing point of solvent (water): -0.58 freezing point of unknown: -0.93 Mass of solvent (water): 19 ml Mass of unknown:

    asked by Jamie on September 12, 2017
  79. Chemistry - Unit Analysis

    The molar mass of cupric chloride is 134.45g/mol. What is the mass, in grams, of 8.19*10^-3 mol of this compound?

    asked by Farah on January 20, 2011
  80. Chemistry

    an unknown compound is known to contain 30.34%N and 60.56%O and has a molar mass of 92.00g. what are the empirical formula and the molecular formula for the compound?( O=16.0g/mol,N=14.1g/mol)

    asked by Bill on May 15, 2018
  81. Chemistry

    an unknown compound is known to contain 30.34%M and 60.56%O and has a molar mass of 92.00g. what are the empirical formula and the molecular formula for the compound?( O=16.0g/mol,M=14.1g/mol)

    asked by Bill on May 15, 2018
  82. Physics

    an unknown compound is known to contain 30.34%M and 60.56%O and has a molar mass of 92.00g. what are the empirical formula and the molecular formula for the compound?( O=16.0g/mol,M=14.1g/mol

    asked by Kenry on April 2, 2018
  83. chemistry

    A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. What is the molecular formula?

    asked by w on January 20, 2010
  84. Chemistry

    Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:----- Molecular

    asked by Abraham on March 25, 2010
  85. Chemistry

    Combustion analysis of 0.284 g of a compound containing C, H, and O produces 0.623 g of CO2 and 0.340 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula: Molecular

    asked by Darali on April 8, 2010
  86. chemistry

    Combustion analysis of 0.213 g of a compound containing C, H, and O produces 0.468 g of CO2 and 0.255 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:(-------)

    asked by sam on April 3, 2010
  87. AP Chemistry

    An unknown compound contains only the three elements C,H, and O. A pure sample of the compound is analyzed and found to be 65.60 percent C and 9.44 percent H by mass. a.)Determine the empirical formula of the compound. b.)A solution of 1.570 grams of the

    asked by some kid on January 5, 2009
  88. chemistry

    what is the percent composition by mass of water in a compound with a gram formula mass of 4905 g/mol

    asked by mike on November 28, 2010
  89. Chemistry grade 11

    An organic compound is composed of C, H and O. A 0.1005 g sample of this is combusted, producing 0.2829 g CO2 and 0.1159 g of H2O. What is the empirical formula of this compound? If the compound has a molar mass of 14 g/mol. What is the molecular formula?

    asked by Sim on January 10, 2015
  90. Chemistry

    A solution was made by dissolving 62.07grams of a compound in 500g of water. The compound was not ionic. The freezing point of the solution was measured and found to be -1.86degrees celsius. The molar mass of this compound can be calculated to be? I know I

    asked by Hannah on February 15, 2012
  91. Chemistry

    0.717 g of a compound containing carbon, hydrogen, and oxygen is burned and found to produce 1.02 g CO2 and 0.624 g H2O. The molar mass of the compound is 124 g/mol. (a) Write a chemical equation for the combustion of this unknown hydrocarbon. (b)

    asked by Franklin on August 24, 2011
  92. College Physics

    A welder using a tank of volume 1¡Ñ10−2m3 fills it with oxygen (with a molar mass of 32.0g/mol ) at a gauge pressure of 1.4¡Ñ105Pa and temperature of 37.0∘C. Find the initial mass of oxygen. R=8.314m3PaK-1mol-1. The answer¡¦s unit is g.

    asked by Desperate Student on March 26, 2016
  93. chem

    A gaseous compound has the following composition by mass: C, 25.0%; H, 2.1%; F, 39.6%; O, 33.3%. Its molecular weight is 48 g/mol

    asked by chemistry on December 13, 2010
  94. physics

    The magnitude of each force is 283 N, the force on the right is applied at an angle 41 and the mass of the block is 27 kg. The coefficient of friction is 0.283. The acceleration of gravity is 9.8 m/s2 . 27 kg μ = 0.283 283 N 41 degrees 283 N What is the

    asked by james on November 10, 2013
  95. Chemistry

    If the heat of combustion for a specific compound is -1060.0 kJ/mol and its molar mass is 58.31 g/mol, how many grams of this compound must you burn to release 589.10 kJ of heat? I don't understand even how to begin this question, so can you walk it step

    asked by Peter on October 10, 2018
  96. Chemistry

    0.717 g of a compound containing carbon, hydrogen, and oxygen is burned and found to produce 1.02 g CO2 and 0.624 g H2O. The molar mass of the compound is 124 g/mol. (a) Write a chemical equation for the combustion of this unknown hydrocarbon. (b)

    asked by Anonymous on August 24, 2011
  97. Chemistry

    A 1.516 M solution is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.

    asked by Anonymous on November 4, 2014
  98. Chemistry please help

    A 1.516 M soltion is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.

    asked by Anonymous on November 5, 2014
  99. chemistry

    Hi, please help me with this question If 600 mL of 0.283 M aqueous NaBr and 15.9 L of gaseous Cl2 measured at STP are reacted stoichiometrically according to the balanced equation, how many liters of gaseous Cl2 measured at STP remain? Round your answer to

    asked by Judy on June 2, 2010
  100. chemistry

    If 600 mL of 0.283 M aqueous NaBr and 15.9 L of gaseous Cl2 measured at STP are reacted stoichiometrically according to the balanced equation, how many liters of gaseous Cl2 measured at STP remain? Round your answer to 3 significant figures. 2NaBr(aq) +

    asked by Judy on June 6, 2010