Physical Chemistry

A mole of air (80% Nitrogen, and 20% Oxygen by volume) at 298.15K is brought into contact with liquid water which has a vapor pressure of 3168Pa at this temperature.

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

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