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  4. The number of moles of oxygen present in one litre of air under standard conditions (it contains 21% oxygen) is:

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Q. The number of moles of oxygen present in one litre of air under standard conditions (it contains 21% oxygen) is:

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Solution:

Air contains 21% of oxygen $ \therefore $ volume of oxygen $ =\frac{21}{100}= $ 0.21 litre $ \therefore $ Number of moles of oxygen present in 0.21 litre at NTP $ =\frac{0.21}{22.4}=0.0093 $