ThermochemistryHard

Question

The factor of ΔG values is important in metallurgy. The ΔG values for the following reactions at 800o C 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

Options

A.−357 kJ
B.−731 kJ
C.−773 kJ
D.−229 kJ

Solution

From $(a) - (b) + (c);$

$\Delta H = ( - 544) - (293) + ( - 480) = - 731\text{ kJ}$

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