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QUESTION
Q65) The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is ... [ CBSE PMT 1995]




SOLUTION

At STP 22.14 litre contains 1 mole of gases
∴ 1 litre contains (1/22.1) moles
Oxygen is 21% of (1/22.4) moles=0.0093 moleAnswer: (d)