Chapter 8.7, Problem 12PE

Interpretation Introduction

Interpretation: The $\Delta H_{\text{rxn}}$ for the reaction of ${\text{H}}_{\text{2}}$ and ${\text{N}}_{\text{2}}$ to form ammonia is to be calculated using average bond energies.

Concept introduction: The $\Delta H_{\text{rxn}}$ is calculated by the formula,

$\Delta H_{\text{rxn}}={\displaystyle \sum \Delta H_{\text{bond}\text{breaking}}}-{\displaystyle \sum \Delta H_{\text{bond}\text{forming}}}$

To determine: The $\Delta H_{\text{rxn}}$ for the reaction of ${\text{H}}_{\text{2}}$ and ${\text{N}}_{\text{2}}$ to form ammonia using average bond energies.