The heat of combustion, also known as the enthalpy of combustion, is the energy released when a substance combusts (burns) completely in the presence of oxygen. It is typically expressed in units such as joules per gram (J/g) or kilojoules per mole (kJ/mol). This thermodynamic quantity can vary depending on the conditions of the combustion (such as temperature and pressure) and the physical state of the reactants and products.
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