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Relative lowering in vapour pressure of a solution containing non volatile solute is the ratio of
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Number of moles of solute to total number of moles of solution.
(A)
$\left(\frac{P_{0}-P}{P_{0}}\right)=x_{2}=\frac{n_{2}}{n_{1}+n_{2}}$
$\left(\frac{P_{0}-P}{P_{0}}\right)=x_{2}=\frac{n_{2}}{n_{1}+n_{2}}$
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