Chapter 13, Problem 44E

Interpretation Introduction

Interpretation: The value of $\text{ΔH}$ for the given reaction with the help of given lattice energy, IE and ${\text{ΔH}}_{\text{sub}}$ needs to be determined.

  $\begin{array}{l}{\text{S}}^{\text{-}}{}_{\text{(g)}}{\text{ + e}}^{\text{-}}\stackrel{}{\to }{\text{S}}^{\text{2-}}{}_{\text{(g)}}\\ {\text{S}}_{\text{(s)}}\stackrel{}{\to }{\text{S}}_{\text{(g)}}\text{ ΔH = 277kJ/mol}\\ {\text{S}}_{\text{(g)}}{\text{+ e}}^{\text{-}}\stackrel{}{\to }{\text{S}}^{\text{-}}{}_{\text{(g)}}\text{ ΔH= - 200 kJ/mol}\end{array}$

Concept Introduction:

A chemical compound can be formed by either ionic bond or covalent bond between bonded atoms. The ionic compound is formed by opposite charge ions; cations and anions. The covalent compound is formed by sharing of electrons between bonded atoms.

Lattice energy can be defined as the energy released if the component ions were brought together from infinity to form the compound or the energy required to break the compound into its respective ions.