At STP air contains 22.4% by volume of oxygen. The number of moles of oxygen present in 1 litre of air are

0.1

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0.01

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0.02

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Solution

The correct option is B
0.01

100 L $\to$ 22.4L , 22.4L $\to$ 1 mole

100L of air contains 1 mole oxygen

1L of air contains 0.01 mole

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What will be the number of moles of oxygen in one litre of air containing 21% oxygen by volume under standard conditions?

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