Chapter 8, Problem 84QP

Interpretation Introduction

Interpretation:

The enthalpy changes for the given reaction by using average bond enthalpies is to be determined.

Concept introduction:

Bond enthalpy is defined as the energy required to break a bond in one mole of agaseous molecule.

The enthalpy of the reaction is calculated by the expression as follows:

$\Delta H_{\text{rxn}}{}^{\circ }=\sum \text{BE}\left(\text{reactants}\right)-\sum \text{BE}\left(\text{products}\right)$

Here, $\Delta H_{\text{rxn}}{}^{\circ }$ is the enthalpy of the reaction, $\sum \text{BE}\left(\text{reactants}\right)$ is the sum of the average bond enthalpies of reactants, and $\sum \text{BE}\left(\text{products}\right)$ is the sum of the average bond enthalpies of products.