A wetted-wall column operating at a total pressure of 518 mm Hg is supplied with water and air, the latter at a rate of 120 g/min. The partial pressure of the water vapor in the airstream is 76 mm Hg, and the vapor pressure of the liquid-water film on the wall of the tower is 138 mm Hg. The observed rate of vaporization of water into the air is 13.1 g/min. The same equipment, now at a total pressure of 820 mm, is supplied with air at the same temperature as before and at a rate of 100 g/min. The liquid vaporized is n-butyl alcohol. The partial pressure of the alcohol is 30.5 mm, and the vapor pressure of the liquid alcohol is 54.5 mm. What rate of vaporization, in grams per minute, may be expected in the experiment with n-butyl alcohol?