Dry air whose molar analysis is 78.1 percent N2, 20.9 percent O2, and 1 percent Ar flows

Question:

Dry air whose molar analysis is 78.1 percent N2, 20.9 percent O2, and 1 percent Ar flows over a water body until it is saturated. If the pressure and temperature of air remain constant at 1 atm and 25oC during the process, determine
(a) The molar analysis of the saturated air and
(b) The density of air before and after the process. What do you conclude from your results?