Question

The factor of $\Delta G$ values is important in metallurgy. The $\Delta G$ values for the following reactions at 800ºC are given as :
$S_2(s) + 2O_2(g) \longrightarrow 2SO_2(g)$; $\Delta G$ = – 544 kJ
$2Zn(s) + S_2(s) \longrightarrow 2ZnS(s)$; $\Delta G$ = – 293 kJ
$2Zn(s) + O_2(g) \longrightarrow 2ZnO(s)$; $\Delta G$ = – 480 kJ
Then $\Delta G$ for the reaction :
$2ZnS(s) + 3O_2(g) \longrightarrow 2ZnO(s) + 2SO_2(g)$
will be :
(a) –357 kJ
(b) –731 kJ
(c) –773 kJ
(d) –229 kJ

Answer 1

(a) part is the correct option