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<p>of formation.</p>

<p>The standard enthalpy of formation is measured in units of energy per amount of substance, usually stated in <a href="page.php?w=Joule_per_mole">kilojoule per mole</a> (kJ&nbsp;mol<sup>-1</sup>), but also in <a href="page.php?w=kilocalorie_per_mole">kilocalorie per mole</a>, <a href="page.php?w=joule">joule</a> per mole or kilocalorie per <a href="page.php?w=gram_%28unit%29">gram</a> (any combination of these units conforming to the energy per mass or amount guideline).</p>

<p>All elements in their reference states (<a href="page.php?w=oxygen">oxygen</a></p><p>
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