7. Gases

What is the molar mass of a gas if a 0.212 g sample takes up a volume of 99.056 mL at 122°C and 1.02 atm pressure?

What mass of helium gas is present in a 14.5 L sample at 273 K and 1 atm, assuming ideal gas behavior? Express your answer in grams.

What volume will 4.70 g of nitrogen gas (N₂) occupy at STP?

An unknown gas has a density of 0.0262 g/mL at a pressure of 0.918 atm and a temperature of 10°C. Using the Ideal Gas Law, what is the molar mass of the gas?