QuestionThermochemistry / Hess's law
Sphalerite (ZnS) is the sulphide ore of zinc. Given : \(\Delta_f H^\circ_{298}\) (in kJ mol⁻¹) for sphalerite, ZnO(s) and SO₂(g) are −206, −348 and −296, respectively, the \(\Delta_r H^\circ_{298}\) (in kJ mol⁻¹) for the roasting of sphalerite ore will be
- (a) −850
- (b) 438
- (c) −438
- (d) −258
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