Chapter 18, Problem 18.127MP

Interpretation Introduction

(a)

Interpretation:

The equation that shows temperature dependence of equilibrium constant with entropy is to be derived

Concept introduction:

The formula that determines spontaneity of the reaction is,

$\Delta G°=\Delta H°-T\Delta S°$

Where,

• $\Delta S°$ denotes entropy change of reaction.
• $\Delta H°$ denotes enthalpy change of reaction

The expression to evaluate free energy from equilibrium constant is as follows:

$\Delta G°=-RT\ln K$

Where,

• $K$ represents equilibrium constant.
• $\Delta G°$ denotes standard free energy change.
• $R$ denotes gas constant.
• $T$ denotes temperature.

Interpretation Introduction

(b)

Interpretation:

The manner in that this equation can be used to determine experimental values of $\Delta H°$, $\Delta S°$ should be explained.

Concept introduction:

The formula that determines spontaneity of the reaction is,

$\Delta G°=\Delta H°-T\Delta S°$

Where,

• $\Delta S°$ denotes entropy change of reaction.
• $\Delta H°$ denotes enthalpy change of reaction

The expression to evaluate free energy from equilibrium constant is as follows:

$\Delta G°=-RT\ln K$

Where,

• $K$ represents equilibrium constant.
• $\Delta G°$ denotes standard free energy change.
• $R$ denotes gas constant.
• $T$ denotes temperature.

Interpretation Introduction

(c)

Interpretation:

Sign of $\Delta H°$ should be predicted on the basis of the given equation.

Concept introduction:

The formula that determines spontaneity of the reaction is,

$\Delta G°=\Delta H°-T\Delta S°$

Where,

• $\Delta S°$ denotes entropy change of reaction.
• $\Delta H°$ denotes enthalpy change of reaction

The expression to evaluate free energy from equilibrium constant is as follows:

$\Delta G°=-RT\ln K$

Where,

• $K$ represents equilibrium constant.
• $\Delta G°$ denotes standard free energy change.
• $R$ denotes gas constant.
• $T$ denotes temperature.