The Standard enthalpy change of formation reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Standard enthalpy change of formation

Due to conservation of energy and Hess's Law, enthalpies of formation can be used to calculate the heat absorbed or released in any chemical reaction. Thus, enthalpies of formation have been determined and tabulated for a wide variety of compounds.

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