What is Heat of Combustion?

At a particular temperature and 1 atm pressure, 1 gm-mole of substance completely burn with O₂. From this reaction heat is evolve that heat is known as heat of combustion of that substance.

Importance of combustion heat:

1. We can determine reaction enthalpy and formation enthalpy by using heat of combustion.
2. To deter mine the formation of compound
3. To determine the calorie of food and fuel.