Air at a temperature of 30 C and a pressure of 100 kPa has a relative humidity of 80%. Calculate (a) The molal humidity

Air at a temperature of 30 °C \n and a pressure of 100 kPa has a relative humidity of 80%. Calculate 

(a) The molal humidity of the air 

(b) Saturated molal humidity of this air if its temperature is reduced to 15 ^oC and its pressure increased to 200 kPa, condensing out some of the water 

(c) Weight of water condensed from 100 m³ of the original we air in cooling to 15oC and compressing to 200 kPa 

(d) The final volume of the wet air of part (c). 

Vapor pressure of water at 30 °C  = 4.24 kPa vapor pressure of water at 15 ^oC = 1.7 kPa