Types of enthalpy changes (chemical energetics)

Types of enthalpy changes, including enthalpy of formation, enthalpy of combustion, and enthalpy of reaction, play a vital role in thermodynamics by quantifying the heat absorbed or released during chemical processes.

ΔH_r ^o is a thermodynamic property that describes the standard enthalpy change of any reaction.

As reactions are classified into different categories (e.g. combustion, neutralisation and hydration), standard enthalpy changes are similarly categorised as:

1. 1. Standard enthalpy change of formation, ΔH_f ^o
   2. Standard enthalpy change of vaporisation, ΔH_vap ^o
   3. Standard enthalpy change of fusion, ΔH_fus ^o
   4. Standard enthalpy change of sublimation, ΔH_sub ^o
   5. Standard enthalpy change of combustion, ΔH_c^o
   6. Standard enthalpy change of neutralisation, ΔH_n ^o
   7. Standard enthalpy change of atomisation, ΔH_at ^o
   8. Standard enthalpy change of ionisation, ΔH_ion ^o
   9. Standard enthalpy change of electron gain, ΔH_eg ^o
   10. Standard enthalpy change of hydration, ΔH_hyd ^o
   11. Standard enthalpy change of solution, ΔH_sol ^o
   12. Standard enthalpy change of lattice energy, ΔH_latt ^o
   13. Other standard enthalpy changes

 

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