The energy of a given bond is the change of enthalpy of the reaction which breaks 1 mole of such bonds. It is a mean value calculated on many similar bonds.
| Bond |
Bond energy $kJ$ $25^oC$ $1bar$ |
| H-H | 436 |
| H-F | 565 |
| H-Cl | 431 |
| H-Br | 364 |
| H-I | 297 |
| F-F | 155 |
| Cl-Cl | 243 |
| O-O | 138 |
| O=O | 494 |
| O-H | 465 |
| O-F | 184 |
| O-Cl | 205 |
| N-N | 159 |
| NΞN | 942 |
| N-H | 389 |
| N-Cl | 202 |
| C-C | 347 |
| C=C | 620 |
| CΞC | 812 |
| C-H | 414 |
| C-O | 352 |
| C=O | 707 |
| C-Cl | 327 |
| C-N | 293 |
| CΞN | 879 |
| S-S | 264 |
| S-H | 339 |
| S-Cl | 276 |
| P-H | 318 |
| P-Cl | 318 |