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Enthalpy Change During Combustion

Combustion is a chemical process involving burning of a substance in excess of air or oxygen. Energy is always released when a substance undergoes combustion process. Some familiar examples of combustion are:

  • burning of coal, wood.
  • burning of cooking gas, petrol, gasoline.
  • burning of food in our body, etc.


Enthalpy of combustion. It is the enthalpy change accompanying the combustion of one mole of a substance in excess of oxygen or air.

It is denoted by Δ c H.

Since combustion reactions are always exothermic, enthalpy of combustion is always negative.