Enthalpy of formation, also known as the heat of formation, is a measure of the energy change that occurs when one mole of a compound is formed from its constituent elements in their standard states.

G4 energies and Cartesian coordinates for the lowest-energy conformers of all azido compounds optimized at the B3LYP/6-31G(2df,p) level (Table S1). Enthalpies of formation of all compounds calculated ...

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the enthalpy change that occurs when one mole of the substances is formed from its elements in their standard states the standard state of an element is its most stable form under standard conditions ...

The standard molar enthalpy of combustion (Δc H (o) m) and formation (Δf H (o) m) of quaternary ammonium tetrachlorozincate [n-CnH2n+1N(CH3)3]2ZnCl4 have been determined for the hydrocarbon chain ...