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Question

The mass of O atoms present in 5.675 litre of carbon dioxide at STP is:

A
32 g
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B
16 g
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C
8 g
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D
24 g
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Solution

The correct option is C 8 g
Using the interconversion of mole-volume relationship,
We have, the number of moles,
n= Volume of gas (at STP)22.7
n=5.67522.7=0.25 mol
2 moles of O atoms are present in one mole of carbon dioxide.
Number of moles of O present in 0.25 moles of carbon dioxide=2×0.25=0.5 mol
Mass of O atom = (0.5×16) g=8 g

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