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  4. The vapour pressure of a dilute aqueous solution of glucose is 750 mm of Hg at 373 K. The mole fraction of solute is:

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Q. The vapour pressure of a dilute aqueous solution of glucose is $750 mm$ of $Hg$ at $373 K$. The mole fraction of solute is:

NEETNEET 2022

Solution:

$\frac{ P ^0- P _{ s }}{ P ^0}=\frac{ n }{ n + N }$
(At $373 K$ V.P. of $H _2 O =760\, mm \,Hg$ )
$\frac{n}{n+N}=\frac{760-750}{760}=\frac{1}{76}$