Chapter 9, Problem 9.108QP

(a)

Interpretation Introduction

Interpretation:

Enthalpy of the reaction using bond energies of reactants and products has 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,

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

(b)

Interpretation Introduction

Interpretation:

Enthalpy of the reaction using enthalpy of formation of reactants and products has to be calculated.

Concept Introduction:

$\Delta H$ 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,

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