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Introduction to Chemistry

The volume of...

Question

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

124.3 L

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1 L

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22.4 L

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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= $\frac{1000}{18} = 55.5 m o l$
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 = $22.4 \times 55.5 L = 1243.2 L$

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