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Question

50 cm3 of hydrogen is collected over water at 17oC and 750 mm Hg pressure. Calculate the volume of dry gas at S.T.P.
[The water vapour pressure at 17oC is 14 mm Hg.]

A
55.58 cm3
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B
45.58 cm3
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C
35.58 cm3
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D
65.58 cm3
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Solution

The correct option is A 45.58 cm3
Given that

P1=750mmHg14mmHg=736mmHg

V1=50cm3,T1=170C=290K

P2=760mmHg

V2=?cm3,T2=00C=273K

Hence the Gas equation

P1V1T1=P2V2T2

736×50290=760×V2273

V2=736×50×273290×760

V2=45.58 cm3

Thus, the volume of dry gas at STP is 45.58 cm3

Hence, the correct option is B

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