Chapter 20.3, Problem 20.5AFP

(a)

Interpretation Introduction

Interpretation:

The standard free energy change $\Delta {\text{G}}_{\text{rxn}}^{\text{o}}$ has to be calculated, using $\Delta {\text{G}}_{\text{f}}^{\text{o}}$ values of given reaction at $298K$.

    $4NO\left(g\right)+C{l}_2\left(g\right)\stackrel{}{\to }2NOCl\left(g\right)$

Concept introduction:

Free energy change$\left({\text{ΔG}}^{\text{o}}\right)$: change in the free energy takes place while reactant converts to product where both are in standard state.

Free energy (Gibbs free energy) is the term that is used to explain the total energy content in a thermodynamic system that can be converted into work.  The free energy is represented by the letter $\text{G}$.  All spontaneous process is associated with the decrease of free energy in the system.  The standard free energy change ${\text{(ΔG}}^{\text{°}}{}_{\text{rxn}})$ is the difference in free energy of the reactants and products in their standard state.

  ${\text{ΔG}}^{\text{°}}{}_{\text{rxn}}\text{=}\sum {\text{nΔG}}_{\text{f}}{}^{\text{°}}\text{(Products)-}\sum {\text{nΔG}}_{\text{f}}{}^{\text{°}}\text{(Reactants)}$

Where,

  $\text{'n'}$ is the number of moles of products and reactants.

(b)

Interpretation Introduction

Interpretation:

The standard free energy change $\Delta {\text{G}}_{\text{rxn}}^{\text{o}}$ has to be calculated, using $\Delta {\text{G}}_{\text{f}}^{\text{o}}$ values of given reaction at $298K$.

    $3H_2\left(g\right)+F{e}_2{O}_3\left(s\right)\stackrel{}{\to }2Fe\left(s\right)+3H_{2}O\left(g\right)$

Concept introduction:

Free energy change$\left({\text{ΔG}}^{\text{o}}\right)$: change in the free energy takes place while reactant converts to product where both are in standard state.

Free energy (Gibbs free energy) is the term that is used to explain the total energy content in a thermodynamic system that can be converted into work.  The free energy is represented by the letter $\text{G}$.  All spontaneous process is associated with the decrease of free energy in the system.  The standard free energy change ${\text{(ΔG}}^{\text{°}}{}_{\text{rxn}})$ is the difference in free energy of the reactants and products in their standard state.

  ${\text{ΔG}}^{\text{°}}{}_{\text{rxn}}\text{=}\sum {\text{nΔG}}_{\text{f}}{}^{\text{°}}\text{(Products)-}\sum {\text{nΔG}}_{\text{f}}{}^{\text{°}}\text{(Reactants)}$

Where,

  $\text{'n'}$ is the number of moles of products and reactants.