Chapter 11, Problem 11.41SP

Interpretation Introduction

Interpretation:

Entropy of fusion $\left(\Delta S_{\text{fusion}}\right)$ for ${\text{TiCl}}_{\text{4}}$ is to be determined.

Concept introduction:

Phase diagram is a graph that represents the solid phase, liquid phase, and gaseous phase of one substance or mixture of substance under various conditions of temperature and pressure.

Temperature and pressure on a phase diagram at which gas, liquid, and solid phases coexist is called triple point. The maximum temperature and pressure in the phase diagram at which substance lies in liquid phases is called critical point. The temperature and pressure at which liquid or gas is neither a true liquid nor a true gas is called supercritical point.

The formula to relate enthalpy and entropy change is as follows:

$\Delta G=\Delta H-T\Delta S$

Where,

• $\Delta G$ is free energy change.
• $\Delta H$ is enthalpy change.
• $\Delta S$ is entropy change.

At equilibrium, free energy change $\left(\Delta G\right)$ is 0.

The relation between enthalpy change $\left(\Delta H\right)$ and degree of randomness $\left(\Delta S\right)$ is as follows:

$\Delta S=\frac{\Delta H}{T}$