Chapter 13, Problem 127AP

Interpretation Introduction

Interpretation:

The molality of the solution, with the given diagram of vapor pressure curves for pure benzene and a solution of a nonvolatile solute in benzene, is to be calculated.

Concept introduction:

Boiling point elevation is a colligative property, which occurs due to the addition of a nonvolatile solute. It is defined as the difference between the boiling point of the solution and the boiling point of the pure solvent.

Anincrease in the solvent’s boiling point by the addition of a solute is calculated by the expression given below:

$\Delta T_b=K_b.m$

Here, $m$ is the molality, $K_b$ is the boilingpoint elevation constant, and $\Delta T_b$ is the boiling point elevation.