The factor of ΔG value is important in metallurgy. The ΔG value for the following reactions at 800°C are given as: S₂(g) + 2O₂(g) → 2SO₂(g); ΔG = -x kJ 2Zn(s) + S₂(g) → 2ZnS(s); ΔG = -93 kJ 2Zn(s) + O₂(g) → 2ZnO(s); ΔG = -y kJ The ΔG for the reaction, 2ZnS(g) + 3O₂(g) → 2ZnO(g) + 2SO₂(g) will be: -z kJ
-x kJ
-y kJ
-z kJ
-293 kJ
Solution:
ΔG of the reaction is given by: ΔGreaction = ΔG₁ - ΔG₂ + ΔG₃ ΔGreaction = -x + 93 - y = -z kJ