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Two liquid A and B have vapour pressure ...

Two liquid A and B have vapour pressure in the ratio ` P_A^(@) : P_B^(@)`=1.3 at a certain temperature.Assume A and B from an ideal solution and the ratio of mole fractions of A to B in the vapour phase is 4 : 3, then the mole fraction of B in the solution at the same tempreature is :

A

`1/5`

B

`2/3`

C

`4/5`

D

`1/4`

Text Solution

Verified by Experts

The correct Answer is:
A
`y_A/y_B=(P_A^@x_A)/(P_B^@x_B)`
`4/3=1/3xx x_A/x_B, x_A + x_B =1`
`x_A=4x_B`
`x_B=1//5`
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