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

A

350

B

300

C

700

D

360

Text Solution

Verified by Experts

The correct Answer is:
A
Let the vapour pressure of pure ethyl alcohol be `P_("eth")^@`
According to Raoult.s law
`290 = 200 xx0.4+P_("eth")^(0)xx0.6 `
`P_("eth")^(0)=(290-80)/(0.6) = 350 ` mm Hg.
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