The figure depicted shows the plot of Δ H and T Δ 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 Δ H . The relation of the change in free energy, change in enthalpy and change in entropy is given by formula, Δ G = Δ H − T Δ S To determine: The status of the process at the point where the two lines intersect.

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Chapter 18, Problem 18.6VP

(a)

Interpretation Introduction

Interpretation: The figure depicted shows the plot of ΔH and TΔS 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 ΔH .

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

ΔG=ΔH−TΔS

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.

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