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Question

Moist air is filled inside a room with total pressure of 100 kPa, and at 25C. If the moist air is saturated with mass of dry air as 50 kg, the mass of vapour in the room is (use saturation pressure of water at 25C as 3.17 kPa)

A
10.18 kg
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B
1.018 kg
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C
9.98 kg
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D
0.998 kg
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Solution

The correct option is B 1.018 kg
ω=0.622×PvPtPv=0.622×3.171003.17

ω=0.020363kg/kgd.a.

ω=mass of vapourmass of dry air=0.020363

Mass of vapour =50×0.020363=1.018kg

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