The factor of δ G values is important in metallurgy. The δ G values for the following reactions at 800°C are given as: (s) + 2(g) - 2(g); δ G = -544 kJ; 2Zn(s) + (s) - 2ZnS(s); δ G = -293 kJ; 2Zn(s)

Question

The factor of δ G values is important in metallurgy. The δ G values for the following reactions at 800°C are given as: $S_2$(s) + 2$O_2$(g) -> 2$SO_2$(g); δ G = -544 kJ; 2Zn(s) + $S_2$(s) -> 2ZnS(s); δ G = -293 kJ; 2Zn(s) + $O_2$(g) -> 2ZnO(s); δ G = -480 kJ. The δ G for the reaction: 2ZnS(s) + 3$O_2$(g) -> 2ZnO(s) + 2$SO_2$(g) will be

Prashant Kotian · Accepted Answer

Correct answer: B. (1) 2ZnS(s) -> 2Zn(s) + (s); dG = +293. (2) (s) + 2(g) -> 2(g); dG = -544. (3) 2Zn(s) + (g) -> 2ZnO(s); dG = -480. Sum: 2ZnS(s) + 3(g) -> 2ZnO(s) + 2(g); δ G = 293 - 544 - 480 = -731 kJ.

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