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Use Hess’ Law to determine the ΔH ̊f for acetic acid. HC2H3O2(l) + 2O2(g) → 2CO2(g) + 2H2O(l) ΔH ̊ = -875 kJ/mol C(s) + O2(g) → 2CO2(g) ΔH ̊ = -394.51 kJ/mol H2(g) + 0.5O2(g) → H2O(g) ΔH ̊ = -483.6 kJ/mol