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Question

What will be the number of moles of oxygen in one litre of air containing 21% oxygen by volume under standard conditions?



A

0.003

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B

0.006

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C

0.009

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D

0.012

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Solution

The correct option is C

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 mole.


Chemistry

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