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The number of moles of oxygen in one lit...

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

A

0.0093 mole

B

0.21 mole

C

2.10 mole

D

0.186 mole

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The correct Answer is:
A
(a) 21% of1 liter is 0.21 liter. 22.4 liter=1mole at STP `therefore0.21 liter=(0.21)/(22.4)=0.0093`mole
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