Chapter 16, Problem 25QRT

(a)

Interpretation Introduction

Interpretation:

The substance between $\text{NaCl}\left(\text{s}\right)$ and $\text{CaO}\left(\text{s}\right)$ which has greater entropy per mole at the same temperature has to be predicted.  The explanation for the corresponding answer has to be stated.

Concept Introduction:

The term entropy is used to represent the randomness in a system.  When a system moves from an ordered arrangement to a less order arrangement, then the entropy of the system increases.  The second law of thermodynamics state that “the entropy of the system either increases or remains the same.”

(b)

Interpretation Introduction

Interpretation:

The substance between ${\text{Cl}}_2\left(\text{g}\right)$ and ${\text{P}}_4\left(\text{g}\right)$ which has greater entropy per mole at same temperature has to be predicted.  The explanation for the corresponding answer has to be stated.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

The substance between ${\text{NH}}_{\text{4}}{\text{NO}}_{\text{3}}\left(\text{s}\right)$ and ${\text{NH}}_{\text{4}}{\text{NO}}_{\text{3}}\left(\text{aq}\right)$ which has greater entropy per mole at same temperature has to be predicted.  The explanation for the corresponding answer has to be stated.

Concept Introduction:

Refer to part (a).