A scuba tank has a volume of cm2. For every deep dives, the tank is filled with (by volume) pure oxygen and 50% pure helium.
(a) How many molecules are there of each type in the tank if at 20oC the gauge pressure reads atm?
(b) What is the ratio of the average kinetic energies of the two types of molecules?
(c) What is the ratio of the rms speeds of the two types of molecules.