Chapter 20.1, Problem 20.1AFP

(a)

Interpretation Introduction

Interpretation: The substance with higher entropy from ${\text{PCl}}_{\text{3}}\left(g\right)$ and ${\text{PCl}}_5\left(g\right)$ needs to be identified.

Concept Introduction: The entropy of any substance is defined by its degree of randomness. It increases with the molecular weight of a substance and its complexity. If concentration and pressure increase, the entropy of the substance decreases. Also, it depends on the state of the substance. For example, solid substances have less entropy as compared to liquid and gaseous substances that have maximum entropy. For substances in the same state, the substance with higher molecular weight has greater entropy.

(b)

Interpretation Introduction

Interpretation: The substance with higher entropy from ${\text{CaF}}_{\text{2}}\left(s\right)$ and ${\text{BaCl}}_{\text{2}}\left(s\right)$ needs to be identified.

Concept Introduction: The entropy of any substance is defined by its degree of randomness. It increases with the molecular weight of a substance and its complexity. If concentration and pressure increase, the entropy of the substance decreases. Also, it depends on the state of the substance. For example, solid substances have less entropy as compared to liquid and gaseous substances that have maximum entropy. For substances in the same state, the substance with higher molecular weight has greater entropy.

(c)

Interpretation Introduction

Interpretation: The substance with higher entropy from ${\text{Br}}_{\text{2}}\left(g\right)$ and ${\text{Br}}_{\text{2}}\left(l\right)$ needs to be identified.

Concept Introduction: The entropy of any substance is defined by its degree of randomness. It increases with the molecular weight of a substance and its complexity. If concentration and pressure increase, the entropy of the substance decreases. Also, it depends on the state of the substance. For example, solid substances have less entropy as compared to liquid and gaseous substances that have maximum entropy. For substances in the same state, the substance with higher molecular weight has greater entropy.