Chapter 18, Problem 18.60SP

Interpretation Introduction

Interpretation:

A rough, qualitative plot of standard molar entropy versus temperature for methane gas from $0\text{ K}$ to $298\text{ K}$ should be drawn.

Concept introduction:

The term entropy is defined as the randomness of molecules and it is represented as $S$. The entropy is state function thus entropy change only depends on the system’s initial and final state. Entropy change of system is represented as follows:

$\Delta S=S_{\text{final}}-S_{\text{initial}}$

Where,

• $\Delta S$ is entropy change of system.
• $S_{\text{final}}$ is the initial entropy of the system.
• $S_{\text{initial}}$ is the final entropy of the system.

When randomness or entropy of system increases, the value of $\Delta S$ is positive and when randomness decreases, the value of $\Delta S$ is negative.