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Mole fraction of the toluene in the vapo...

Mole fraction of the toluene in the vapour phase which is in equilibrium with a solution of benzene (`p^(@) = 120` torr ) and toluene (`p^(@)`=80 torr) having 2.0 mol of each is :

A

`0.50`

B

`0.25`

C

`0.60`

D

`0.40`

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The correct Answer is:
D
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