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The vapour pressure of solvent is 20 tor...

The vapour pressure of solvent is `20` torr, while that of its dilute solution is `17` torr, the mole-fraction of the solvent is

A

`0.6`

B

`0.85`

C

`0.5`

D

`0.7`

Text Solution

Verified by Experts

The correct Answer is:
B
From question
`P^(@)=20` torr
`P_(S)=17` torr
`:.(P^(@)-P_(s))/(P^(@))`=X solute
`(3)/(20)`=X solute or =X solute = `0.15`
X solvent =`1-0.15=0.85`
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