The number of moles of oxygen in one litre of air containing 21% oxygen by volume, under standard conditions are:
A
0.0093moles
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B
0.21moles
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C
2.10moles
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D
0.186moles
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Solution
The correct option is A0.0093moles 1 litre of air contains 21% of oxygen.
Total amount of oxygen in 1L=0.21×1L=0.21L
At STP, 22.4L volume is occupied by 1 mole of oxygen
So, 0.21L volume is occupied by =1×0.2122.4=0.0093moles of oxygen