Calculate the mole fraction of solute in solution if vapour pressure of a solution and pure solvent are 27 mm Hg and 30 mm Hg respectively at 298 K.

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TestHub · Accepted Answer

According to Raoult's law, the relative lowering of vapour pressure is equal to the mole fraction of the solute.

$\frac{P ^{0} - P _{s}}{P ^{0}} = x_{solute}$

Given $P^{0} = 30 mm Hg$ and $P_{s} = 27 mm Hg$ .

$x_{solute} = \frac{30 - 27}{30}$

$x_{solute} = \frac{3}{30} = 0.1$

Answer: $0.1$

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