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Question

SO2 at STP contained in a flask was replaced by O2 under identical conditions of pressure, temperature and volume. Then the weight of O2 will be ______ of SO2.

A
half
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B
one fourth
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C
twice
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D
four times
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Solution

The correct option is A half
SO2 at STP contained in a flask was replaced by O2 under identical conditions of pressure, temperature and volume. Then the weight of O2 will be half of SO2. Since, the temperature, pressure and volume are identical, the number of moles are identical.
nO2=nSO2
WO2MO2=WSO2MSO2
WO216=WSO232
WO2=WSO232×16=WSO22

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