3. Enthalpy of combustion
By convention, the combustion of an organic compound is assumed to produce CO2 (g), H2O (l), SO2 (g); nitrogen and halogens do not burn and consequently release I2 (s), Br2 (l), N2 (g), Cl2 (g) and F2 (g).
The combustion reaction of the compound CαHβNγOδSε is therefore written :
The standard enthalpy of combustion of the component CαHβNγ δOε S is calculated, at 298 K, by :
Example: this calculation, applied to the combustion of liquid ethyl alcohol C2H5OH to give liquid water, gives, from the data in table
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Enthalpy of combustion