The standard heat of combustion of a substance is the amount of heat released when 1 mole of the substance is burned in pure oxygen gas, with all substances at 25°C at a pressure of 1 bar.

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The standard heat of combustion is defined as the enthalpy change when one mole of a substance is completely burned in oxygen under standard conditions, which are 25°C and 1 bar pressure.

The Standard Heat of Combustion of a Substance Is the Amount