Chapter 5, Problem 5.138AP

(a)

Interpretation Introduction

Interpretation: The values that represent enthalpies of formation are to be identified.

The $\Delta H_{\text{rxn}}^{\text{ο}}$ for the decomposition of $\text{NOCl}$ is to be calculated.

Concept introduction: The enthalpy of formation $\left(\Delta H_{\text{f}}^{\text{ο}}\right)$ is stated as the change in enthalpy when pure form of elements are mixed together to form one mole of compound at standard conditions.

According to Hess law the total change in enthalpy for a given reaction is the sum of all enthalpy changes occur step by step.

To determine: The representation of given values of $\Delta H_{\text{rxn}}^{\text{ο}}$ as enthalpy of formation.

(b)

Interpretation Introduction

To determine: The $\Delta H_{\text{rxn}}^{\text{ο}}$ for the decomposition of $\text{NOCl}$.