The equation for the combustion of ethanol is:

C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l)

a. Rewrite this equation to show all the bonds in the reactants and products.

b. Use the following bond energies (in kJ mol^–1) to calculate a value for the standard enthalpy change of this reaction:
E(C — C) = +347
E(C — H) = +410
E(C — O) = +336
E(O — O) = +496
E(C — O) = +805
E(O — H) = +465

c. The standard enthalpy change of combustion of ethanol is –1367.3 kJ mol^–1. Suggest why this value differs from the value obtained using bond energies.