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# Standard enthalpy change of combustion

The standard enthalpy of combustion is the enthalpy change when one mole of a substance completely reacts with oxygen under standard thermodynamic conditions (although experimental values are usually obtained under different conditions and subsequently adjusted). By definition, combustion reactions are generally strongly exothermic and so enthalpies of combustion are generally strongly negative.

It is commonly denoted as $\Delta H ^{\circ} _{\mathrm{comb}}$ or $\Delta H ^{\circ}_{\mathrm{c}}$