These tables include heat of formation data gathered from a variety of sources, including the primary and secondary literature, as well as the NIST Chemistry WebBook.

Constants of diatomic molecules (spectroscopic data) for over 600 compounds. You can search for data on specific compounds in the Chemistry WebBook based on name, chemical formula, …

∗The standard entropy of the H+(aq) ion is defined to be 0.

The table below shows the standard enthalpy of formation, the standard Gibbs free energy of formation, standard entropy and molar heat capacity at constant pressure of several inorganic …

This table lists the standard enthalpies (ΔH°), the free energies (ΔG°) of formation of compounds from elements in their standard states, and the thermodynamic (third-law) entropies (S°) of …

The Reference page of our Chemistry Tutorial includes a growing collection of tables and charts containing data that is of interest and value to Chemistry teachers and students.

In chemistry and thermodynamics, the standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the …

Appendix G | Standard Enthalpies of Formation for Selected Substances All enthalpies of formation listed below for selected substances are defined at the standard state of 298.15 K …

Jun 10, 2025 · You can find a heat of formation table for a variety of compounds and a summary of key points to remember when doing enthalpy calculations.

By definition, the standard enthalpy of formation of an element in its most stable form is equal to zero under standard conditions, which is 1 atm for gases and 1 M for solutions.