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Question

The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions are:

A
0.0093 moles
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B
0.21 moles
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C
2.10 moles
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D
0.186 moles
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Solution

The correct option is A 0.0093 moles
1 litre of air contains 21% of oxygen.
Total amount of oxygen in 1 L=0.21×1 L=0.21 L
At STP, 22.4 L volume is occupied by 1 mole of oxygen
So, 0.21 L volume is occupied by =1×0.2122.4=0.0093 moles of oxygen

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