The values of ΔG are very important in metallurgy. The ΔG values for the following reactions at 1000

Question

The values of ΔG are very important in metallurgy. The ΔG values for the following reactions at 1000 K are given as follows.

S₂(s) + 2O₂(g) → 2SO₂(g); ΔG = −544 kJ

2Zn(s) + S₂(s) → 2ZnS(s); ΔG = −293 kJ

2Zn(s) + O₂(g) → 2ZnO(s); ΔG = −480 kJ

The ΔG for the reaction 2ZnS(s) + 3O₂(g) → 2ZnO(s) + 2SO₂(g) will be

Accepted Answer

$\Delta_{r}G = \left\lbrack ( - 480) + ( - 544) ightbrack - \left\lbrack ( - 293) ightbrack = - 731	ext{ kJ}$$	herefore S_{2} = 2.5 + 4 	imes 2 	imes 0.7 = 8.1	ext{ cal/K.mol}$

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