A cylindrical water tank of diameter equal to 1 m has been kept open to atmosphere. The water level in the tank is maintained at the level 1 m below the top of the tank. If the dry air at 313 K is blown across the top of the tank, how many moles of water will be lost from the tank per hour? Data: For air-water system, DAB = 2.6 x 105 m/s at 298 K. Vapour pressure of water: 313 K = 7.4 KN / m (16) (Nov/Dec '08)