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a) what is the volume of the dry air if the pressure is 1 bar?

b) what is the final volume of the air saturated with water vapor if the total pressure is maintained at 1 bar?

c) what are the mole fractions of N2, O2, and H20 in the moist air? Assume all gases are ideal

I need help setting up the problem, I have no clue on where to start. I started with PV=nRT but I don't know if thats right. At my school we do not have a tutor for this class so any help is greatful. thank you