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3. Calculate the enthalpy of formation of carbon dioxide in the following reaction : C (s) + O2 (g) → CO2 (g) Use the following equations: a) H2O (l) → H2 (g) + 1/2O2(g) ΔH°f= +285.8 kJ/mol b) C2H6 (g) → 2C (s) + 3H2 (g) ΔH°f= +84.7 kJ/mol c) 2CO2 (g) + 3H2O (l) → C2H6 (g) + (7/2) O2 (g) ΔH°f= +1560.7 kJ/mol