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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

`0.4`

C

`0.5`

D

`0.7`

Text Solution

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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") =0.6`
`X_("solvent") =0.4`
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