The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

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A. 3.33%
B. 5.55%
C. 33.33%
D. 55.55%

Correct Answer: Option C

C. 33.33%

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