Chapter 20.3, Problem 20.4BFP

Interpretation Introduction

Interpretation:

The standard free energy change of given reaction has to be determined.

Concept introduction:

Hess's law:

The enthalpy change of a reaction is equal to the sum of enthalpy changes in each step.

  ${\text{ΔH}}^o{}_{\text{rxn}}\text{=}{\displaystyle \sum {\text{nΔH}}_f{{}^{\text{o}}}_{\text{product}}}\text{-}{\displaystyle \sum {\text{nΔH}}_f{{}^{\text{o}}}_{\text{reactant}}}$

Standard Free Energy Changes:

The ${\text{ΔG}}^{\text{0}}$ is by writing the Gibbs equation at standard-state conditions and using to find ${\text{ΔH}}^{\text{0}}{}_{sys}$ and ${\text{ΔS}}^{\text{0}}{}_{sys}$ Adapting the Gibbs equation

  ${\text{ΔG}}^{\text{0}}{}_{\text{sys}}\text{=}{\text{ΔH}}_{\text{sys}}^{\text{o}}\text{-}{\text{TΔS}}_{\text{sys}}^{\text{o}}$