Chapter 18, Problem 74QP

Interpretation Introduction

Interpretation:

The minimum value of $\Delta S$ for the reaction is to be calculated with given value and temperature.

Concept introduction:

Entropy is a thermodynamic function. Entropy is a measure of randomness or disorder of the system. The unit of entropy is $\text{J/K}\text{.mol}$.

When the entropy is positive, the process is spontaneous and for an equilibrium process the entropy is zero.

The quantity that predicts the spontaneity of a process is called Gibbs free energy. The mathematical equation is as follows:

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

Here, $\Delta G$ is the change in Gibbs free energy, $\Delta H$ is the enthalpy change of a system, and $\Delta S$ is the entropy change of a system.

The relationship between temperature units, Kelvinand Celsius can be expressed as: $\text{K}{=}^{\circ }\text{C}+273$

The relationship between kilojoules and joules can be expressed as:

$1\text{kJ}=1000\text{J}$

To convert kilojoules to joules, conversion factor is $\frac{1000\text{J}}{1\text{ kJ}}$.