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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

350

B

300

C

700

D

360

Text Solution

Verified by Experts

Let the vapour pressure of pure ethyl alcohol be P, According to Raoult’s law
`290=200xx0.4+Pxx0.6`
`P=(290-80)/0.6=350` mm Hg
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