Chapter 18, Problem 18.6VP

(a)

Interpretation Introduction

Interpretation: The figure depicted shows the plot of $\Delta H$ and $T\Delta S$ for a phase change as a function of temperature is given. The questions based on the figures are to be answered.

Concept introduction: Spontaneous processes are those processes which start itself without any external source of energy. It is a self driven process.

Enthalpy change for a reaction is generally a change in energy in terms of the heat.

Entropy is a thermodynamic property which shows the randomness or disorder of the atoms within the system.

Free energy is the unused amount of energy of the system and is denoted by $\Delta H$.

The relation of the change in free energy, change in enthalpy and change in entropy is given by formula,

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

To determine: The status of the process at the point where the two lines intersect.

(b)

Interpretation Introduction

To determine: The temperature range at which process is spontaneous.