Chapter 20.3, Problem 20.5BFP

(a)

Interpretation Introduction

Interpretation:

The change in standard Gibbs free energy of reaction needs to be calculated for the given reaction at $25{}^{\text{o}}\text{C}$ .

  ${\text{4NH}}_3\left(g\right)+5{\text{O}}_{\text{2}}\left(g\right)\to \text{4NO}\left(g\right)+{\text{6H}}_{\text{2}}\text{O}\left(g\right)$

Concept Introduction:

The change in standard Gibbs free energy of a reaction can be calculated using the change in Gibbs free energy of formation of reactant and products from the thermodynamic table (at 298 K).

The formula used is as follows:

  $\Delta G_{\text{reaction}}={\displaystyle \sum \Delta G_{\text{product}}}-{\displaystyle \sum \Delta G_{\text{reactant}}}$

(b)

Interpretation Introduction

Interpretation: The change in standard Gibbs free energy of reaction needs to be calculated for the given reaction at $25{}^{\text{o}}\text{C}$ .

  $\text{2C}\left(\text{graphite}\right)+{\text{O}}_{\text{2}}\left(g\right)\to 2\text{CO}\left(g\right)$

Concept Introduction:

The change in standard Gibbs free energy of a reaction can be calculated using the change in Gibbs free energy of formation of reactant and products from the thermodynamic table (at 298 K).

The formula used is as follows:

  $\Delta G_{\text{reaction}}={\displaystyle \sum \Delta G_{\text{product}}}-{\displaystyle \sum \Delta G_{\text{reactant}}}$