AIIMS 2018 Chemistry Gibbs Free Energy MCQ Question

The factor of ΔG values is important in metallurgy. The ΔG values for the following reactions at 800°C are given as S₂(g) + 2O₂(g) → 2SO₂(g); ΔG = -544kJ 2Zn(s) + S₂(g) → 2ZnS(s); ΔG = -293kJ 2Zn(s) + O₂(g) → 2ZnO(s); ΔG = -480kJ The ΔG for the reaction, 2ZnS(g) + 3O₂(g) → 2ZnO(g) + 2SO₂(g) will be