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.

ΔHo 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. Standard enthalpy change of formation, ΔHf o
    2. Standard enthalpy change of vaporisation, ΔHvap o
    3. Standard enthalpy change of fusion, ΔHfus o
    4. Standard enthalpy change of sublimation, ΔHsub o
    5. Standard enthalpy change of combustion, ΔHco
    6. Standard enthalpy change of neutralisation, ΔHn o
    7. Standard enthalpy change of atomisation, ΔHat o
    8. Standard enthalpy change of ionisation, ΔHion o
    9. Standard enthalpy change of electron gain, ΔHeg o
    10. Standard enthalpy change of hydration, ΔHhyd o
    11. Standard enthalpy change of solution, ΔHsol o
    12. Standard enthalpy change of lattice energy, ΔHlatt o
    13. Other standard enthalpy changes

 

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