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.
ΔHr 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:
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- Standard enthalpy change of formation, ΔHf o
- Standard enthalpy change of vaporisation, ΔHvap o
- Standard enthalpy change of fusion, ΔHfus o
- Standard enthalpy change of sublimation, ΔHsub o
- Standard enthalpy change of combustion, ΔHco
- Standard enthalpy change of neutralisation, ΔHn o
- Standard enthalpy change of atomisation, ΔHat o
- Standard enthalpy change of ionisation, ΔHion o
- Standard enthalpy change of electron gain, ΔHeg o
- Standard enthalpy change of hydration, ΔHhyd o
- Standard enthalpy change of solution, ΔHsol o
- Standard enthalpy change of lattice energy, ΔHlatt o
- Other standard enthalpy changes