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Question

The volume of 1 L water upon vaporisation at STP is nearly

A
124.3 L
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B
1 L
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C
22.4 L
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D
1243.2 L
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Solution

The correct option is D 1243.2 L
The density of water is 1 kg/L and its molar mass is 18 g/mol:
So, the number of moles of water in 1 L=100018=55.5 mol
We know that, at STP, one mole of an ideal gas occupies a volume of 22.4 liters. Therefore, the volume of 55.5 moles of an assumed-to-be ideal gas = 22.4×55.5 L=1243.2 L

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