Chapter 16, Problem 49E

(a)

Interpretation Introduction

Interpretation: It is given that, sulfur undergoes a phase change from the rhombic crystal structure to the monoclinic crystal form at temperatures above $95°\text{C}$. The sign of $\Delta S$ and $\Delta H$ is to be predicted for this change. The form of sulfur that has the more ordered crystalline structure is to be identified.

Concept introduction: Entropy is the measure of degree of disorder or randomness. The value of $\Delta S$ is calculated using the formula,

$\Delta S=\frac{\Delta H}{T}$.

(b)

Interpretation Introduction

Interpretation: It is given that, sulfur undergoes a phase change from the rhombic crystal structure to the monoclinic crystal form at temperatures above $95°\text{C}$. The sign of $\Delta S$ and $\Delta H$ is to be predicted for this change. The form of sulfur that has the more ordered crystalline structure is to be identified.

Concept introduction: Entropy is the measure of degree of disorder or randomness. The value of $\Delta S$ is calculated using the formula,

$\Delta S=\frac{\Delta H}{T}$.