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The first step in the industrial recovery of zinc from zinc sulfide ore is roasting, that is, the conversion of ZnS toZnO by heating: calculate the heat of reaction (in kJ) if 15g SO2 was collected. Was heat absorbed or released? 2ZnS (s) + 3O2 (g) ----> 2ZnO (s) + 2SO2 (g)

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