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What is the mass of water vapour in 1m^(...

What is the mass of water vapour in `1m^(3)` of air with 0.4 relative humidity at 300K? (Aqueous tension at 300 K=3.6 K Pa)

A

22.12 gm

B

10.53 gm

C

4.68 gm

D

2.86 gm

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The correct Answer is:
B
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