Chapter 17, Problem 24E

Interpretation Introduction

Interpretation:The equation for $\Delta {\text{H}}_{\text{soln}}$ and $\Delta {\text{H}}_{\text{hyd}}$ for ionic compound KF along with the use of Hess’s law to calculate $\Delta {\text{H}}_{\text{soln}}$ from $\Delta {\text{H}}_{\text{hyd}}$ and $\Delta {\text{H}}_{\text{LE}}$ . Also, the reason for large negative value of $\Delta {\text{H}}_{\text{LE}}$ and $\Delta {\text{H}}_{\text{hyd}}$ should be provided.

Concept Introduction:Hess' law can be used to calculate the enthalpy of a chemical reaction. It states that the change of enthalpy in a chemical reaction does not depend on the pathway but it depends on the initial and final states. It is also called as Constant Heat Summation law.It can be represented as:

  $\Delta \text{H = }\Delta {\text{H}}_{\text{1}}+\Delta {\text{H}}_{\text{2}}+\Delta {\text{H}}_{\text{3}}\mathrm{.....}$