Chapter 18, Problem 81IL

Interpretation Introduction

Interpretation:

The value of ${\text{Δ}}_{\text{f}}{\text{G}}^{\text{o}}$ for $\text{HI}\left(\text{g}\right)$ at $\text{350 }°\text{C}$ should be calculated under given conditions.

Concept introduction:

The Gibbs free energy or the free energy change is a thermodynamic quantity represented by ${\text{ΔG}}^{\text{o}}$.

${\text{Δ}}_{\text{f}}{\text{G}}^{\text{o}}$ is related to the reaction quotient $\text{Q}$ by the expression,

  ${\text{Δ}}_{\text{f}}{\text{G = Δ}}_{\text{f}}{\text{G}}^{\text{°}}\text{+ RT lnQ}$

For a general reaction, $\text{aA + bB}\to \text{cC + dD}$

  $\text{Q = }\frac{{\left[\text{C}\right]}^{\text{c}}{\left[\text{D}\right]}^{\text{d}}}{{\left[\text{A}\right]}^{\text{a}}{\left[\text{B}\right]}^{\text{b}}}$