Chapter 16, Problem 30QRT

(a)

Interpretation Introduction

Interpretation:

Whether the standard entropy change of the reaction, $2{\text{NH}}_3\left(\text{g}\right)\to {\text{N}}_{\text{2}}\left(\text{g}\right)+3{\text{H}}_{\text{2}}\left(\text{g}\right)$, will positive or negative has to be predicted

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:

Whether the standard entropy change of the reaction, $2\text{Na}\left(\text{s}\right)+{\text{Cl}}_{\text{2}}\left(\text{g}\right)\to 2\text{NaCl}\left(\text{s}\right)$, will positive or negative has to be predicted.

Concept Introduction:

Refer to part (a).

(c)

Interpretation Introduction

Interpretation:

Whether the standard entropy change of the reaction, ${\text{H}}_{\text{2}}\left(\text{g}\right)+{\text{I}}_{\text{2}}\left(\text{s}\right)\to 2\text{HI}\left(\text{g}\right)$, will positive or negative has to be predicted.

Concept Introduction:

Refer to part (a).