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Benzene and toluene forms an ideal solut...

Benzene and toluene forms an ideal solution. Vapour pressure of pure benzene is 100 torr while that of pure toluene is 50 torr. If mole faction of benzene in liquid phase is `(1)/(3)`. Then calculate the mole fraction of benzene in vapour phase :

A

`(2)/(3)`

B

`(1)/(2)`

C

`(2)/(5)`

D

`(1)/(3)`

Text Solution

Verified by Experts

The correct Answer is:
B
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Benzene and toluene form ideal solution over the entire range of composition. The vapour pressures of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in the vapour phase if 80 g of benzene is mixed with 100 g of toluene.

Knowledge Check

  • Benzene and toluene combine to form an ideal solution. At 80^(@)C , vapour pressure of pure benzene is 800 mmHg and the vapour pressure of pure toluene is 300 mmHg. If the vapour pressure of the solution is 400 mmHg, what are the mole fractions of benzene and toluene?

    A
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    B
    50% benzene and 50% toluene
    C
    40% benzene and 60% toluene
    D
    20% benzene and 80% toluene

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    A
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    D
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