4. A wetted wall column with an inside diameter of 1.44 inches is to be used to humidify air at 29C. The length of the mass transfer section is 100 cm, and the Reynolds number for the air flow through the column is 4775. The diffusivity of water in air is 0.220 cm/s at 0C. The following data for the vapor pressure of water are available: T (C) P* (mmHg) 11.2 10 22.1 20 34.0 40 If the air entering the bottom of the column is bone dry, what is the composition of the air leaving the column