is the heat evolved or absorbed when one mole of a compound is formed in their standard state from its constituent elements.
the heat evolved or absorbed during the formation of one mole of a substance from its component elements
a measure of the binding energy of a molecule, set such that the heat of formation of O2 is 0 kcal/mol.
The heat change which occurs when one mole of a compound is formed from its elements in their standard states.
Energy which would be required to form a molecule from dissociated atoms. If positive, the structure will not be formed spontaneously. Lower heats of formation indicate more stable molecules, which are formed preferentially. A difference of one kcal/mol means that the more stable geometry will be approximately 10 times more common.
In planetology, the heat released by the infall of matter during the formation of a planetary body.