QuestionThermochemistry / Hess’s law
In the refining of sulphide ores, the ore is roasted with oxygen to form metal oxide and SO₂ (g). The Δ_rH°₂₉₈ for the roasting of sphalerite (ZnS) will be : (where, Δ_fH°₂₉₈ (ZnS) = − 206 kJ mol⁻¹, Δ_fH°₂₉₈ (ZnO) = − 348 kJ mol⁻¹ and Δ_fH°₂₉₈ (SO₂) = − 296 kJ mol⁻¹)
- (a) − 238 kJ
- (b) − 438 kJ
- (c) − 583 kJ
- (d) − 590 kJ
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