In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is

Mole fraction of water vapour = 0.02Mole fraction of dry air = 1 – 0.02 = 0.98Total pressure of saturated air = 1.2 atmUsing Dalton’s law of partial pressure,PDry air =PTotal xDry air =1.2×0.98= 1.176 atm