Chapter 4, Problem 4.8NP

(a)

Interpretation Introduction

Interpretation:

The value of $\Delta {\text{H}}_R^o$ and $\Delta {\text{U}}_R^o$ should be calculated for the following reaction by assuming ideal gas behavior.

  $\text{OH(g})\to \text{H(g) + O(g)}$

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.

The mathematical expression for the standard enthalpy is:

According Hess’s law,

  $\Delta {\text{H}}^o=\Delta {\text{H}}_1^o+\Delta {\text{H}}_2^o+\Delta {\text{H}}_3^o$

The mathematical expression for standard internal energy change is:

  $\Delta H^o=\Delta U^o+\Delta PV$

  $\Delta U^o=\Delta H^o-\Delta nRT$

(b)

Interpretation Introduction

Interpretation:

The value of $\Delta {\text{H}}_R^o$ and $\Delta {\text{U}}_R^o$ should be calculated for the following reaction by considering ideal gas behavior.

  ${\text{H}}_2\text{O(g})\to 2\text{H(g) + O(g)}$

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.

The mathematical expression for the standard enthalpy is:

According Hess’s law,

  $\Delta {\text{H}}^o=\Delta {\text{H}}_1^o+\Delta {\text{H}}_2^o+\Delta {\text{H}}_3^o$

The mathematical expression for standard internal energy change is:

  $\Delta H^o=\Delta U^o+\Delta PV$

  $\Delta U^o=\Delta H^o-\Delta nRT$

(c)

Interpretation Introduction

Interpretation:

The value of $\Delta {\text{H}}_R^o$ and $\Delta {\text{U}}_R^o$ should be calculated for the following reaction by considering ideal gas behavior.

  ${\text{H}}_2\text{O(g})\to \text{H(g) + OH(g)}$

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.

The mathematical expression for the standard enthalpy is:

According Hess’s law,

  $\Delta {\text{H}}^o=\Delta {\text{H}}_1^o+\Delta {\text{H}}_2^o+\Delta {\text{H}}_3^o$

The mathematical expression for standard internal energy change is:

  $\Delta H^o=\Delta U^o+\Delta PV$

  $\Delta U^o=\Delta H^o-\Delta nRT$