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c1702
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the-energy-associated-with-chemical-bonds
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The Energy Balance of a Reaction
Grades
Secondary V
Topic
Chemistry
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Contenu
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Here are two charts showing different bond energies, depending on the types of atom involved and the type of bond (single, double or triple). Note that all values are in kJ/mol.

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The energy of a bond corresponds to the energy required to break one mole of this type of bond in molecules in the gaseous state. As the energy of a bond is strongly influenced by the surrounding atoms, these values are averages and may vary according to the reference works consulted.

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Table 1: Energy associated with single bonds, in kJ/mol

​ ​I Br​ Cl​ S​ P​ Si​ F​ O​ N​ C​ ​H
​H 297​ 368​ 431​ 339​ 318​ 293​ ​569 ​464 ​389 ​414 ​435
​C ​238 276​ 330​ 259​ 264​ 289​ ​439 ​351 ​293 ​347
​N -​ 243​ 201​ -​ 209​ 355​ ​272 ​201 ​159
​O 201​ 201​ 205​ -​ 351​ 368​ ​184 ​138
​F ​273 ​197 ​255 ​327 490​ 540​ ​159
​Si ​213 289​ 360​ 226​ 213​ 176​
​P 213​ 272​ 331​ 230​ 213​
​S -​ 213​ 251​ 213​
​Cl 209​ 218​ 243​
​Br ​180 192​
​I ​151

Table 2: Energy associated with multiple bonds, in kJ/mol

Bond Associated energy (kJ/mol)
​|N=N| ​418
​|C=N| ​615
​|C=C| ​611
​|C=O| ​741
​|O=O| ​498
​|N\equiv N| ​946
​|C\equiv N| ​891
​|C\equiv C| ​835
​|C\equiv O| ​1 077
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Corps

In a chemical reaction, note that if the bond is on the reactant side, its sign will be positive. If the bond is on the product side, the sign will be negative.

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Energy Associated with Chemical Bonds (PDF document)
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