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The mass of water vapour in a given volume of a... - WAEC Physics 2000 Question

The mass of water vapour in a given volume of air is 0.05g at 20oC, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air
A
3.33%
B
5.55%
C
33.33%
D
55.55%
correct option: c
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