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Question:

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