Chapter 5, Problem 38P

(a)

Interpretation Introduction

Interpretation:

From the given reaction, the reaction which has larger $\Delta S^0$ value has to be identified.

Concept introduction:

 Entropy: it is a measure of the freedom of motion in a system.  Restricting the freedom of motion of a molecule depresses its entropy.

 ${\text{ΔS}}^{\text{0}}\text{=}\text{Freedom}\text{of}\text{motion}\text{of}\text{the}\text{products}\text{-}\text{Freedom}\text{of}\text{motion}\text{of}\text{the}\text{reactants}$

 $\Delta S^0$ Value of reaction will be positive only if the products possess greater freedom of motion than the reactant.

(b)

Interpretation Introduction

Interpretation:

It has to be checked that the reactions which have whether positive or negative $\Delta S^0$ value.

Concept introduction:

 Entropy: it is a measure of the freedom of motion in a system.  Restricting the freedom of motion of a molecule depresses its entropy.

${\text{ΔS}}^{\text{0}}\text{=}\text{Freedom}\text{of}\text{motion}\text{of}\text{the}\text{products}\text{-}\text{Freedom}\text{of}\text{motion}\text{of}\text{the}\text{reactants}$

$\Delta S^0$ value of reaction will be positive only if the products possess greater freedom of motion than the reactant.