calculating heat

The first step in the industrial recovery of zinc from the zinc sulfide ore is roasting, that is, the conversion of ZnS to ZnO by heating:

2ZnS (s) + 3O2 (g) —-> 2ZnO (s) + 2SO2 (g)
Change in H = -879kJ/mol

Calculate the heat evolved (in kJ) per grams of ZnS roasted.


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