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Solution: Calculate ΔH°298 for the process Co3O4(s) ⟶ 3Co(s) + 2O2(g) from the following information:Co(s) + 1/2O2(g) ⟶ CoO(s)  ΔH°298 = −237.9kJ 3CoO(s) +1/2O2(g) ⟶ Co3O4(s)  ΔH°298 = −177.5kJ

Problem

Calculate ΔH°298 for the process Co3O4(s) ⟶ 3Co(s) + 2O2(g) from the following information:
Co(s) + 1/2O2(g) ⟶ CoO(s)  ΔH°298 = −237.9kJ 

3CoO(s) +1/2O2(g) ⟶ Co3O4(s)  ΔH°298 = −177.5kJ