0.5mole of a gas (mol. wt. = 20) occupies 11.2L at STP. The volume occupied by 0.25mole of a lighter gas (mol. wt. = 2) at STP will be:
A
11.2L
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B
5.6L
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C
2.8L
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D
22.4L
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Solution
The correct option is B 5.6L At STP, the volume occupied is directly proportional to the number of moles of a gas.
1 mole of any gas equals to 22.4L of gas at STP. 11.2Lofheaviergas0.5moleofheaviergas=Volumeoflightergas0.25moleoflightergas ∴ Volume of lighter gas =11.20.5×0.25=5.6L