Chapter 4, Problem 4F.1ST

Interpretation Introduction

Interpretation:

The composition of the phases and their proportions for a mixture of $\text{50}\text{g}$ hexane and $\text{100}\text{g}$ of nitrobenzene at $\text{273}\text{K}$ has to be determined. The temperature that the sample must be heated to in order to obtain a single phase has to be determined.

Concept introduction:

Phase diagram is a representation of the phases of a substance under different conditions of pressure and temperature. The phase diagram of a binary mixture is mostly plotted between the temperature and mole fraction of one of the components.

The lever rule is mainly used to determine compositions of phases and the relative proportions of phases to each other in Binary diagrams of compounds and using the lever rule we can determine quantitatively the relative composition of a mixture in a two phase region in a phase diagram.

According to lever rule, we can write,

$n=n^{\text{'}}+n^{\text{'}\text{'}}\boxed{\begin{array}{l}Where,\\ n^{\text{'}}:Totalamountofmoleculeinonephase\\ n^{\text{'}\text{'}}:Totalamountintheotherphase\end{array}}$