a. How many grams of CO2 are contained in a sample that occupies a volume of 5.00 L at 850 torr and 25 °C ? 125 b. What is the volume occupied at STP if the gas has a volume Of 12.0 L at 25°C and 3.10 atm?

A 2.65 g sample of an unknown gas at 21 °C and 1.10 atm is stored in a 1.05 L flask. What is the density of the gas? density: g/L What is the molar mass of the gas? molar mass: g/mol

1. A 0.678 gram sample of gas occupies 0.214 L at standard conditions; what is the molar mass of the gas? 2. A sample of gas occupies 250. mL at 37°C and 730, torr; what volume would the gas occupy at standard conditions? 3. A 5.00 mL sample of an unknown liquid is vaporized in a flask having a volume of 285 mL. At 100°C, 0.4168 g of the vapor exerts a pressure of 740 torr. Calculate the gram molar mass of the unknown liquid. 4. Calculate the density of oxygen gas at 50°C and 750. torr. 5. Calculate the density of H2S at STP. 86

A 3.35 g sample of an unknown gas at 79 °C and 1.00 atm is stored in a 2.15 L flask. What is the density of the gas? density: g/L What is the molar mass of the gas? molar mass: g/mol

2. If the pressure exerted on a 300.0 mL sample of hydrogen gas at con- stant temperature is increased from 0.500 atm to 0.750 atm, what will be the final volume of the sample? A belium balloon has a volume of 5.0 L at a pressure of 101.3 kPa. The

At 450 mm Hg and 85oC, a sample of carbon monoxide gas occupies a volume of 0.250 L. The gas is transferred to a 2.00-L flask and the temperature is reduced to -20oC. What is the pressure of the gas in the flask?

6. A sample of argon has a volume of 1.2 L at STP. If the temperature is increased to 22°C and the pressure is lowered to 0.80 atm, what will the new volume be, in L?

A 3.85 g sample of an unknown gas at 73 °C and 1.05 atm is stored in a 1.35 L flask. What is the density of the gas? density: g/L What is the molar mass of the gas? molar mass: g/mol

4. A glass container was initially charged with 2.00 moles of a gas sample at 3.75 atm and 21.7 °C. Some of the gas was released as the temperature was increased to 28.1 °C, so the final pressure in the container was reduced to 0.998 atm. Assume the volume stayed the same. How many moles of the gas sample are present at the end?

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