= Standard enthalpy of formation
{title2=$\Delta H_{\rm f}^{\circ}$}
{wiki}
The <standard enthalpy of formation> is the <enthalpy> change for forming one <mole> of a specified <chemical substance> from its <chemical elements> in their reference states at the stated <temperature>. For <sodium chloride> at $298.15\,\mathrm K$, those reactant states are <solid> <sodium> and diatomic gaseous <chlorine>. <Standard state> specifies conditions; it does not by itself select a <temperature>.
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