As a gas (insoluble in liquid) is bubbled through a liquid, part of the liquid vaporises and these vapours are carried off with the gas. As a sample of dry nitrogen gas is bubbled through a liquid, it

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As a gas (insoluble in liquid) is bubbled through a liquid, part of the liquid vaporises and these vapours are carried off with the gas. As a sample of dry nitrogen gas is bubbled through a liquid, it is found that under identical conditions of temperature and pressure, a definite volume of wet nitrogen gas weighs more than the equal volume of dry nitrogen gas. Hence, the liquid through which dry nitrogen gas was passed, may be

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At the same T and P, equal volumes contain the same total moles; wet N2 weighs more only if the vapour carried has molar mass greater than N2 (28 g/mol), so that replacing some N2 by vapour raises the mass. M(C6H6) = 78 and M(CCl4) = 154 exceed 28, while M(H2O) = 18 and M(D2O) = 20 do not. Hence (b) and (c).

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