2. A sample of gas at 245°C and a pressure of 2.5 atm occupies a volume of 12.3 L. What volume would it occupy at STP?

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

12. What is the molar mass of a gas that has a density of 5.75 g/L at STP?

If a sample of carbon dioxide gas in a 455.0 ml container has a pressure of 725.0 mmHg at -49.0oC, what would be the pressure at 115.0oC?

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?

1. A gas occupies 18.5 L at STP. What volume will it occupy at 735 torr and 57°C? 23.1 L              a. A gas occupies 32.6 L at 2.00 atm pressure and 27°C. Calculate its volume if the pressure remains at 2.0 atm but the temperature is raised to 54°C.

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?

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 ? 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 8.12 g gas at the pressure of 1090 mmHg and temperature of 20oC occupies a volume of 2.00 L.  How many grams of gas is added to the same container to change the pressure to 2.00 atm. and temperature of -20oC?

Calculate the density of CO2 in g / L , at STP. Calculate number of moles of gas that occupies a volume of 1.75 L