Chapter 11, Problem 11.123CHP

Interpretation Introduction

Interpretation:

The van’t Hoff factor for $KCl$ has to be determined given its molality and vapor pressure depression of the solution at $298K.$

Concept Introduction:

• The lowering of vapor pressure of the solvent due to the addition of non-volatile solute is expressed as,

$\Delta P=P_A^{°}{X}_B$

Where,

$X_B$ is the mole fraction of the solute, $P_A^{°}$ is the vapor pressure of solvent in its pure state.

• Mole fraction and vapor pressure are related by the equation,

$\frac{P°-P}{P°}=i\times X_B$

Where,

$\begin{array}{l}P=vaporpressureofthesolution\\ P°=vaporpressurepuresolvent\\ X_B=molefractionofsolute\end{array}$