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Question

# At 40∘C, the actual amount of water vapour present in 1m3 of air is 45 g. If the temperature decreases to 30∘C, then the amount of water vapour that condenses is _______ g. [Take the mass of water vapour present in 1m3 of saturated air at 30∘C as 30 g].

A
75
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B
10
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C
25
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D
15
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Solution

## The correct option is D 15At 40℃, amount of water vapor in 1m3 of air=45gAlso, mass of water vapor present in 1m3 of saturated air is 30g at 30℃So when temperature is decreased to 30℃, the amount of water vapor that condenses is only 15g.

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