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A solution has 1:3 ratio of cyclopent...

A solution has 1:3 ratio of cyclopentane to cyclohexane . The vapour pressure of the pure compounds at `25^(@)C ` are 331 mm Hg for cyclohexane . What is the mole fraction of cyclopenyance in the vapour above the solution ?

A

`0.42`

B

`0.39`

C

`0.49`

D

`0.23`

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The correct Answer is:
C
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