Bond Energies

Single Bonds
 Hydrogen  Carbon  Nitrogen  Oxygen  Sulfur  Halogens

Bond
 Energy
(kJ/mol)
 
Bond
 Energy
(kJ/mol)
 
Bond
 Energy
(kJ/mol)
 
Bond
 Energy
(kJ/mol)
 
Bond
 Energy
(kJ/mol)
 
Bond
 Energy
(kJ/mol)
 H–H  436  C–H  410*  N–H  390*  O–H  460*  S–H  340*  Br–F  234
 H–O  460*  C–O  350*  N–O  200*  O–O  142*  S–O  265*  Br–Cl  219
 H–F  569  C–F  450*  N–F  270*  O–F  180*  S–F  310*  Br–Br  194
 H–Cl  432  C–Cl      330*  N–Cl  200*  O–Cl  200*  S–Cl  250*  Br–I  179
 H–Br  366  C–Br  270*  N–Br  240*  O–Br  210*  S–Br  210*  Cl–F  251
 H–I  298  C–I  240*  N–I  159*  O–I  220*  S–I  170*  Cl–Cl  243
 H–C  410*  C–C  350*  N–C  300*  O–C  350*  S–C  260*  F–F
 157
 H–N  390*  C–N  300*  N–N  240*  O–N  200*  S–N   
 I–F
 280
 H–S  340*  C–S  260*  N–S   
 O–S  265*  S–S  225*  I–I
 153

*indicates an energy that is an average for that type of bond in several different molecules.

Multiple Bonds
 Bond kJ/mol
 O=O  498
 C=C  611*
 C≡C  835*
 C=O  745*
 C≡O  1077
 N=O  607*
 N=N  418*
 N≡N  941
 C=N  615*
 C≡N  891*
 C=S  477 *

Reference: CRC Handbook of Chemistry and Physics, 2007


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