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Q.

A 3.00 L oxygen gas is collected over water at 27°C when the barometric pressure is 787 torr. If vapour pressure of water is 27 torr at 27°C, moles of O2 gas will be

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a

0.122

b

0.126

c

0.004

d

0.l52

answer is A.

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Detailed Solution

pO2=787−27=760 torr =1atm p=nVRT ∴ 1=n3×0.0821×300 n=0.122mol
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