Question

1.47 litres of a gas is collected over water at 30°C and a barometric pressure of 744 mm. If the gas has a weighto-
1.98 g and the vapour pressure of water at 30°C is 32 mm, what is the molecular weight of the gas ?
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Answer 1

Given

w = 1.98g

V = 1.47 litre

T = 303 K

P = 744 - 32 = 712mm = 712760 atm

Since For dry gas , PV=wmRT

=712760×1.47=1.98m×0.0821×303

∴m=35.76g

Hence answer is (c)

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