This protocol calculates standard heat of formation of a molecule, ΔfHO(298.15 K). It calls a harmonic vibrational calculation that provides the ZPVE and other thermodynamic contributions, and energy calculations of the molecule and the atoms it constitutes of.

To account for standard states of the elements, tabulated data are used. The complete procedure is described in ref. [1].

  1. http://www.gaussian.com/g_whitepap/thermo.htm