6. Calculate the enthalpy of formation of zinc sulfate from simple substances at T = 298 K based on the following data:
ZnS = Zn S, *H10 = 200.5 kJ mol-1,
2ZnS 3O2 = 2ZnO 2SO2, *H20 = -893.5 kJ mol-1,
2SO2 O2 = 2SO3, *H30 = -198.2 kJ mol-1,
ZnSO4 = ZnO SO3, *H40 = 235.0 kJ mol-1.
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