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A mixture of ethyl alcohol and propyl al...

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300K. The vapour pressure of propyl alcohol is 200 mm. if the mole fraction of ethyl alcohol is `0.6`, its vapour pressure (in mm) at the same temperature will be

A

`700`

B

`360`

C

`350`

D

`300`

Text Solution

Verified by Experts

The correct Answer is:
C
According to Raoult's law
`P=P_(A)+P_(B)=P_(B)^(@)X_(B)` or `290=P_(A)^(@)xx(0.6)+200xx(1-0.6)`
or `290=0.6xxP_(A)^(@)+0.4xx200` or `P_(A)^(@)=350mm`.
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