If po and ps are vapour pressures of the solvent and solution respectively, n1 and n2 are the mole fractions of solvent and solute respectively, then

From Raoult's law,
$\frac{p^{o} - P_{s}}{p^{o}} = n_{2} \Rightarrow 1 - \frac{p_{s}}{p^{o}} = n_{2} \frac{p_{s}}{p^{o}} = 1 - n_{2} = n_{1} p_{s} = n_{1} \times p^{o}$

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If p^o and p_s are vapour pressures of the solvent and solution respectively, n₁ and n₂ are the mole fractions of solvent and solute respectively, then

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