Mixtures of helium and oxygen are used in scuba diving tanks to help prevent "the bends". For a particular dive, 29.0 L of oxygen gas at 25.0 C and 1.82 atm, and 6.31 L of helium gas at 25.0 C and 1.27 atm were pumped into a tank with a volume of 6.00 L at 25.0 C.
Calculate (in atm):
1. the partial pressure of oxygen
2. the partial pressure of helium
3. the total pressure in the tank at 25.0 C.