Chapter 9, Problem 9.111QP

Interpretation Introduction

Interpretation:

Enthalpy of the reaction using average bond enthalpies of reactants and products and using enthalpy formation values have to be calculated.

Concept Introduction:

$\Delta H°$ refers to change in enthalpy.  Change in enthalpy in a reaction and bond energy (BE) are related as,

    $\text{ΔH°}\text{=}\text{ΣBE}\text{(reactants)}\text{-}\text{ΣBE}\text{(products)}$

$\Delta H$ refers to change in enthalpy.  Change in enthalpy in a reaction and enthalpy of formation are related by the formula,

    $\Delta H_{rxn}^{°}=\Sigma \Delta H_f^{°}(product)-\Sigma \Delta H_f^{°}(reac\tan t)$

Where,

    $\begin{array}{l}\Delta H_{rxn}^{°}=\text{ enthalpy change in reaction}\\ \Delta H_f^{°}(product)=\text{ enthalpy or heat of formation of product}\\ \Delta H_f^{°}(reac\tan t)=\text{ enthalpy or heat of formation of }reac\tan t\end{array}$