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Enthalpy or Heat of Formation

The amount of heat evolved or absorbed when one mole of a substance is formed from its constituent elements is called the heat of formation.

Standard enthalpy of formation (H°f)

It is the enthalpy change of a reaction by which a compound is formed from its constituent elements, the reactants and products, at standard state (i.e., at 298 K and 1 atm pressure).
The compounds having positive enthalpies of formation are called endothermic compounds and are less stable than the reactants. The compounds having negative enthalpies of formation are known as exothermic compounds and are more stable than the reactants.

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