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

350

300

700

360

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The correct Answer is:

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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