# The vapour pressure of a solvent in a solution is proportional to

$\begin{array}{1 1}\text{the mole fraction of the solute}\\\text{the mole fraction of the solvent}\\\text{the molality of the solvent}\\\text{the normality of the solute}\end{array}$

Answer : the mole fraction of the solvent
The vapour pressure of a solvent in a solution is proportional to the mole fraction of the solvent