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  4. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. 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

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Q. A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of $290\, mm$ at $300\, K$. 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

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Solution:

Let the vapour pressure of pure ethyl alcohol be P, According to Raoult’s law
$P=\frac{290-80}{0.6}=350\,mm\,Hg$