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Question

A vessel contains 1.6 g of dioxygen at STP (273.15K, 1 atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. The volume of the new vessel is:

A
2.24 L
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B
22.4 L
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C
11.2 L
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D
1.12 L
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Solution

The correct option is A 2.24 L
1.6 g of oxygen corresponds to 1.632=0.05 moles.
It occupies a volume of 22.4×0.05=1.12 L at STP.
When the pressure is reduced to half, the volume is doubled.
The new volume is 2×1.12=2.24 L.

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