b. A rigid, 2.0 m' volume tank holds humid air at a temperature of 160.1C and a pressure of 400kPa. The air has a relative humidity of 20%. If now heat is removed until the temperature reaches 21.1C, estimate:- i The initial specific humidity of the air (10 marks) 11. The total amount of vapour condensed during the cooling process. (6 marks) 111. The final mole fraction of vapour in the air (6 marks) ke the value of the universal gas constant as 8.314 kJ/kg K, and the mass number of dry air ual to 29