Chapter 10, Problem 40E

(a)

Interpretation Introduction

Interpretation:

Using given data enthalpy of hydration for Calcium chloride and Calcium Iodide to be calculated.

Concept introduction:

Hess’s law: Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states.

${\text{ΔH}}^{\text{0}}={{\displaystyle \sum {\text{ΔH}}^{\text{0}}}}_{\text{f (product)}}-{{\displaystyle \sum {\text{ΔH}}^{\text{0}}}}_{\text{f (reactant)}}$

(b)

Interpretation Introduction

Interpretation:

Based on part (a) answer, which ion ${\text{Cl}}^{\text{-}}$ or ${\text{I}}^{\text{-}}$ more strongly attracted to water has to be predicted.

Concept introduction:

Hess’s law: Hess's law states that the change of enthalpy in a chemical reaction (i.e. the heat of reaction at constant pressure) is independent of the pathway between the initial and final states.

${\text{ΔH}}^{\text{0}}={{\displaystyle \sum {\text{ΔH}}^{\text{0}}}}_{\text{f (product)}}-{{\displaystyle \sum {\text{ΔH}}^{\text{0}}}}_{\text{f (reactant)}}$