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<p>the <a href="page.php?w=carbon">carbon</a>-<a href="page.php?w=hydrogen">hydrogen</a> bond energy in <a href="page.php?w=methane">methane</a> BE<sub>(C-H)</sub> is the enthalpy change (?H) of breaking one molecule of methane into a carbon atom and four hydrogen <a href="page.php?w=Radical_%28chemistry%29">radical</a>s, divided by four. The exact value for a certain pair of bonded elements varies somewhat depending on the specific molecule, so tabulated bond energies are generally averages from a number of selected typical chemical species containing</p><p>
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