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Question

The number of moles of oxygen in one litre of air containing 21% oxygen by volume under standard conditions is X. What is the value of X ?

A
0.009
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B
9
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C
21
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D
0.21
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Solution

The correct option is A 0.009

1000 mL of air at STP contains =21100 × 1000 = 210 mL O2

No.of moles=Vol. in mL under STP conditions22400 mL=21022400 = 0.009 mol
X=0.009
So, X×1000=9


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