Chapter 3, Problem 3B.12P

(a)

Interpretation Introduction

Interpretation: The standard molar entropy of ${\text{NH}}_{\text{3}}$ at $100°\text{C}$ has to be calculated.

Concept introduction: The randomness present in the system is called its entropy.  It is an extensive property.  At equilibrium, the entropy of the system is zero.  It is denoted by $S$.  The entropy for one mole of the substance under standard conditions is called molar entropy.

(b)

Interpretation Introduction

Interpretation: The standard molar entropy of ${\text{NH}}_{\text{3}}$ at $500°\text{C}$ has to be calculated.

Concept introduction: The randomness present in the system is called its entropy.  It is an extensive property.  At equilibrium, the entropy of the system is zero.  It is denoted by $S$.  The entropy for one mole of the substance under standard conditions is called molar entropy.