A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20C respectively. Assuming that the vapour pressure of water at 20C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ?
A. 34
B. 17
C. 20
D. 25
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