What is the difference between enthalpy and enthalpy change?

Enthalpy (H) is the total heat content of a system, which includes both internal energy and the product of pressure and volume. It is a state function, meaning its value depends on the current state of the system. Enthalpy change (ΔH) is the difference in enthalpy between the products and reactants of a chemical reaction. It reflects the heat absorbed or released during the reaction at constant pressure.

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