7. Gases

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.

Helium gas is contained in a tank with a pressure of 11.1 MPa. If the temperature inside the tank is 29.3 °C and the volume of the tank is 16.7 L, determine the mass, in grams, of the helium in the tank using the Ideal Gas Law.

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?

A sample of gas has a mass of 0.565 g. Its volume is 116 mL at a temperature of 87 °C and a pressure of 781 mmHg. Using the Ideal Gas Law, what is the molar mass of the gas?