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  4. One mole of a non-volatile solute is dissolved in two moles of water. The vapor pressure of the solution relative to that of water is

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Q. One mole of a non-volatile solute is dissolved in two moles of water. The vapor pressure of the solution relative to that of water is

Solutions

Solution:

$\frac{p^{\circ}-O_{\text {soln }}}{p}=\frac{1}{1+2}=\frac{1}{3}$

(mole fraction of solute in solution)

or $1-\frac{O_{\text {soln }}}{p}=\frac{1}{3}$

or $\frac{O_{\text {soln }}}{p}=1-\frac{1}{3}=\frac{2}{3}$