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  4. The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole fraction of the solvent is

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Q. The vapour pressure of solvent is 20 torr, while that of its dilute solution is 17 torr, the mole fraction of the solvent is

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Solution:

From question
$P^{\circ}=20$ torr, $PS=17$ torr
$\therefore \frac{P^{o}-P_{s}}{P^{o}}=X_{\text{solute}}$
$\frac{3}{20}=X_{\text{solute}}$
or $=X_{\text{solute}}=0.15$
$X_{\text{solvent}}=0.4$