2. During the combustion of 1 mole of CH3COOH (l.) to CO2 (g.) and H2O (l.)
871.69 kJ/mol. Calculate the enthalpy of formation of acetic acid ΔHobr298 if known:
C(graphite) O2(g)=CO2(g) ΔH298=-393.51 kJ/mol,
H2(g) 1/2O2(g)= H2O(l) ΔH298=-285.85 kJ/mol.

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