Chapter 8, Problem 8.91SP

Interpretation Introduction

Interpretation:

$\Delta H_{rxn}^{°}$ for reaction of ethanol with ethyl acetate has to be calculated in kilojoules.

Concept Introduction:

• The heat content of the system is represented by ‘H’ and it is the sum of internal energy ‘E’ and product of volume and pressure,

$H=E+PV$

• $\Delta H$ refers to change in enthalpy of the system,

$\Delta H=\Delta E+P\Delta V$

• $\Delta H°$ for a reaction using bond dissociation energies is calculated as –

$\Delta H°=D\left(reac\tan t\text{ bonds}\right)-D\left(product\text{ bonds}\right)$

Where,

$\begin{array}{l}D\left(reac\tan t\text{ bonds}\right)=dissociation\text{ energy of bonds in reactant}\\ D\left(product\text{ bonds}\right)=dissociation\text{ energy of bonds in product}\end{array}$