Chapter 13, Problem 114SAE

Interpretation Introduction

(a)

Interpretation:

The reason needs to be explained for a spontaneous change in the reaction, the change in entropy in a system is not always a suitable criterion.

Concept introduction:

Entropy is the measurable quantity which indicates the randomness of the system. The gaseous components have high entropy whereas solid substances have less entropy. According to Second law of Thermodynamics, the entropy of universe will always increase. In other words, the changes in the entropy can never be negative.

$\text{ΔS > 0}$

The Gibb’s equation of thermodynamic purposed a relation between $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$ with Temperature. The mathematical expression of Gibb’s equation can be written as:

$\text{ΔrG}°\text{ = ΔrH}°\text{ - TΔrS}°$

Interpretation Introduction

(b)

Interpretation:

The reason needs to be explained for the importance of ${\text{ΔrG}}^o$ in dealing with questions relayed to the spontaneous change.

Concept introduction:

Entropy is the measurable quantity which indicates the randomness of the system. The gaseous components have high entropy whereas solid substances have less entropy. According to Second law of Thermodynamics, the entropy of universe will always increase. In other words, the changes in the entropy can never be negative.

$\text{ΔS > 0}$

The Gibb’s equation of thermodynamic purposed a relation between $\text{ΔS}$, $\text{ΔH}$ and $\text{ΔG}$ with Temperature. The mathematical expression of Gibb’s equation can be written as:

$\text{ΔrG}°\text{ = ΔrH}°\text{ - TΔrS}°$