3. Enthalpy of combustion

By convention, the combustion of an organic compound is assumed to produce CO ₂ (g), H ₂ O (l), SO ₂ (g); nitrogen and halogens do not burn and consequently release I ₂ (s), Br ₂ (l), N ₂ (g), Cl ₂ (g) and F ₂ (g).

The combustion reaction of the compound C _α H _β N _γ O _δ S _ε is therefore...