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The first step in the industrial recovery of zinc from the zinc sulfide ore is roasting, that is, conversion of ZnS to ZnO by heating: 2ZnS(s)+302(g)- 2ZnO (s)+2S02(g) AH--879 kJ Calculate the heat released (in kJ) per gram of ZnS roasted.

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BlueSky06
In this item, we the given that the heat released for every 2 mols of ZnS is 879 kJ. The amount of ZnS in grams is calculated below,
                     amount of ZnS = (2 mols ZnS) x (97.474 g/mol)
                                             = 194.9 g ZnS
The heat released per gram of ZnS is calculated by dividing 879 kJ by the amount in grams.
                     heat released = 879 kJ/194.9 g
                       heat released = 4.5 kJ/g

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