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Question

The relative humidity is 50%, if the air contains about :

A
2.55g of water vapour at 40C
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B
25.5g of water vapour at 40C
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C
2.55kg of water vapour at 40C
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D
25.5kg of water vapour at 40C
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Solution

The correct option is B 25.5g of water vapour at 40C
Air with a relative humidity of 50% contains a half of the water vapor it could hold at a particular temperature.
So if the air containing 25.5g of water vapour at 40C, them the relative humidity id 50%.

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