- In combustion processes, reactants are consumed to form products and energy is released.
- This energy comes from a rearrangement of chemical bonds in the reactants to form the products.
- The standard enthalpy of formation, ∆hoi , quantifies the chemical bond energy of a chemical species at standard conditions.
- The enthalpy of formation of a substance is the energy needed for the formation of that substance from its constituent elements at STP conditions (25°C and 1 atm).
- The ‘absolute’ or ‘total’ enthalpy = enthalpy of formation + sensible enthalpy
- One way to determine the enthalpy of formation of a species is to use a constant pressure flow reactor
- When phase change is encountered, the total enthalpy needs to include the latent heat
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