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In a mixture of closely related liquids ...

In a mixture of closely related liquids (such as benzene and toluence), the Roult's law states that the ratio `P_(A)` is proportional to the mole fraction of A in the liquid, `P_(A)x_(A)`. Mixtures that obey the law throughout the composition ranges from pure A to pure B are called ideal solutions . In ideal solution the solute also obeys Roult's law . Then the total pressure is given by `P_("total")=P_(A)^(0)x_(A)+P_(B)^(0)x_(B)`
Benzene and toluene froms nearly an ideal solution in which the mole fraction of the benzene is 0.4 . If v.p. of pure benzene is 40 mmHg and toluene is 30 mmHg at a given temperature , then what is the fraction of toluene in the vapour phase?

A

0.6

B

0.47

C

0.53

D

0.74

Text Solution

Verified by Experts

The correct Answer is:
C
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