Chapter 17, Problem 26E

Interpretation Introduction

Interpretation:

The standard entropy change of the reaction is to be calculated and its sign is to be rationalized.

Concept introduction: Molar entropy is the entropy of one mole of the substance.
The standard entropy change of the reaction is calculated as,
$\text{Standard}\text{entropy}\text{change}\text{of}\text{the}\text{reaction}=\left(\begin{array}{l}\text{Total}\text{standard}\text{entropy}\text{of}\text{the}\text{product}\\ -\text{Total}\text{standard}\text{entropy}\text{of}\text{the}\text{reactant}\end{array}\right)$

The entropy of gas is more than that of liquid or solid. The change of entropy of the reaction is possibly positive if the number of gaseous particle on the product side is greater than that on the reactant side.

To determine: The standard entropy change of the reaction and the rationalization of its sign.