1. A 350 cm sample of helium gas is collected at 22.0°C and 99.3 kPa. What volume would this gas occupy at STP?

2. Suppose we have a 12.2 L sample containing 0.5 moles of oxygen gas at a pressure of 1 atm and a temperature of 25°C. If all this oxygen were converted into ozone, at the same temperature and pressure, what would be the volume of ozone?