A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ?
Correct answer: A. 17
- A. 17
- B. 20
- C. 25
- D. 34
Explanation
For saturated vapour, use the water partial pressure of 2.34 kPa in n = pV/RT, giving about 960 mol of water. Multiplying by 18 g/mol gives approximately 17.3 kg.
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