Chapter 21, Problem 21.58QP

Given that ΔG_f° (Fe₂O₃) = −741.0 kJ/mol and that ΔG_f° (Al₂O₃) = −1576.4 kJ/mol, calculate ΔG° for the following reactions at 25°C:

1. (a) $2{\text{Fe}}_2{\text{O}}_3(s)\stackrel{}{\to }4\text{Fe}(s)+3{\text{O}}_2(g)$
2. (b) $2{\text{Al}}_2{\text{O}}_3(s)\stackrel{}{\to }4\text{Al}(s)+3{\text{O}}_2(g)$