Question

A solution is made of 

- 1 mmol of non-volatile solute A

- 2 mmol of non-volatile solute B

- 3 mmol of non-volatile solute C

- 4 mmol of non-volatile solute D

- 0.990 mol of solvent.

Assume that the solvent is water, what is the vapor pressure of this solution at the normal boiling point of water?

Answer 1

This is done by using Raoult's law, which states that, for an ideal solution, the partial vapor pressure of a component in that solution is equal to the mole fraction of that component multiplied by its vapor pressure when pure.