Chapter 8, Problem 8.109QP

Interpretation Introduction

Interpretation:

The given process is exothermic or endothermic has to be explained.

 Concept introduction:

Lattice energy:

The amount of energy that is necessary for the conversion of one mole of ionic solid to its constituent ions in gaseous phase is called Lattice energy.

Hess’s law:

The enthalpy change for given set of reactants to the given set of products is the same, whether the process takes place in single or sequence of steps. This is called as Hess’s law.

Enthalpy is generally calculated from the standard enthalpy of formation.

${\text{ΔH}}_{\text{reaction}}^{\text{o}}\text{=}{\displaystyle \sum {\text{n}}_{\text{p}}{\text{ΔH}}_{\text{f}}^{\text{o}}\text{(products)-}}{\displaystyle \sum {\text{n}}_{\text{p}}}{\text{ΔH}}^{\text{o}}\text{(reactants)}$

With the thermodynamic values from Hess’s law, the lattice energy of ionic compound can be determined.