Worksheet - Ideal Gas Law Gas Density and Molar Mass With Answers II
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February 2, 2010 Chemistry Chapter 11 Ideal Gas Law Worksheet 2 – Density and Molar Mass via Ideal Gas Law 1. What is the density of carbon tetrachloride vapor at 714 torr and 125°C? 2. Find the molar mass of a gas that has a density of 1.18g/L at 25°C and 1 atm? 3. Exactly 250 mL of a gas at STP weighs 0.291g. The composition of the gas is as follows: C, 92.24%, H, 7.76%. What is the molecular formula of the chemical? 4. The average molar mass of the atmosphere at the surface of Titan, Saturn’s largest moon, is 28.6 g/mol. The surface temperature is 95 K, and the pressure is 1.6 atm. Assuming ideal behavior, calculate the density of Titan’s atmosphere. 5. An unknown vapor had a mass of 0.846g; the volume was 354 cm 3 , pressure 752 torr, and temperature 100°C. Calculate the molar mass of the unknown vapor. 6. A 0.109g sample of a pure gaseous compound occupies 112 mL at 100.0°C and 750.0 torr. What is the molar mass of the compound? 7. Nitric aci d, a very important ind ustrial che mical, i s made by dissolvin g the gas nitrogen dio xide, NO 2 , in water. Calculate the density of NO 2 gas, in g/L, at 1.24 atm and 50.0°C. 8. At 27°C, 2.40g of a certain gas occupies a volume of 9.84 L at a pressure of 172 torr. Calculate the molar mass of the gas. 9. A 1.525g mass of a volatile liquid is vaporized, giving 500 mL of vapor when measured over water at 30°C and 770 torr. The vapor pressure of water at 30°C is 32 torr. What is the molar mass of the substance? 10. A gaseous compound is composed of 85.7% of carbon and 14.3% of hydrogen. Its density is 2.28 g/L at 300K and 1.00 atm pressure. Determine the molecular formula of the compound. Miscellaneous 11. A sample of oxygen gas is collected over water. The volume of gas collected is 0.250 L at 26°C and 765 torr total pressure. (Water vapor pressure at 26°C = 25.22 torr) a. How many grams of oxygen gas are collected? b. If the oxygen gas collected is the product of decomposition of potassium chlorate, how many grams of potassium chlorate is decomposed (assuming 100% yield)? 12. Propane liquefies under modest pressure, allowing a large amount to be stored in a container. Calculate the number of moles of propane gas in a 110-L container at 3.00 atm and 27°C. Answers 1. 4.42 g/L 2. 28.87 g/mol 3. C 2 H 2 4. 5.867 g/L 5. 74.0 g/mol 6. 30.2 g/mol 7. 2.15 g/L 8. 26.54 g/mol 9. 78.13 g/mol 10. C 4 H 8 11. a) 0.317g; b)0.810g 12. 13.398 moles
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Transcript of Worksheet - Ideal Gas Law Gas Density and Molar Mass With Answers II
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February 2, 2010
Chemistry
Chapter 11 Ideal Gas Law Worksheet 2 Density and Molar Mass via Ideal Gas Law
1. What is the density of carbon tetrachloride vapor at 714 torr and 125C?
2. Find the molar mass of a gas that has a density of 1.18g/L at 25C and 1 atm?
3. Exactly 250 mL of a gas at STP weighs 0.291g. The composition of the gas is as follows: C, 92.24%,
H, 7.76%. What is the molecular formula of the chemical?
4. The average molar mass of the atmosphere at the surface of Titan, Saturns largest moon, is 28.6 g/mol. The surface temperature is 95 K, and the pressure is 1.6 atm. Assuming ideal behavior, calculate the density of Titans atmosphere.
5. An unknown vapor had a mass of 0.846g; the volume was 354 cm3, pressure 752 torr, and temperature 100C. Calculate the molar mass of the unknown vapor.
6. A 0.109g sample of a pure gaseous compound occupies 112 mL at 100.0C and 750.0 torr. What is the molar mass of the compound?
7. Nitric acid, a very important industrial chemical, is made by dissolving the gas nitrogen dioxide, NO2, in water. Calculate the density of NO2 gas, in g/L, at 1.24 atm and 50.0C.
8. At 27C, 2.40g of a certain gas occupies a volume of 9.84 L at a pressure of 172 torr. Calculate the molar mass of the gas.
9. A 1.525g mass of a volatile liquid is vaporized, giving 500 mL of vapor when measured over water at 30C and 770 torr. The vapor pressure of water at 30C is 32 torr. What is the molar mass of the substance?
10. A gaseous compound is composed of 85.7% of carbon and 14.3% of hydrogen. Its density is 2.28 g/L at 300K and 1.00 atm pressure. Determine the molecular formula of the compound. Miscellaneous
11. A sample of oxygen gas is collected over water. The volume of gas collected is 0.250 L at 26C and 765 torr total pressure. (Water vapor pressure at 26C = 25.22 torr)
a. How many grams of oxygen gas are collected? b. If the oxygen gas collected is the product of decomposition of potassium chlorate, how many
grams of potassium chlorate is decomposed (assuming 100% yield)?
12. Propane liquefies under modest pressure, allowing a large amount to be stored in a container. Calculate the number of moles of propane gas in a 110-L container at 3.00 atm and 27C.
Answers
1. 4.42 g/L 2. 28.87 g/mol 3. C2H2 4. 5.867 g/L
5. 74.0 g/mol 6. 30.2 g/mol 7. 2.15 g/L 8. 26.54 g/mol
9. 78.13 g/mol 10. C4H8 11. a) 0.317g; b)0.810g 12. 13.398 moles
