8.3 Bond Enthalpy
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Bond Enthalpies (a.k.a. Bond Dissociation Energies)
Bond breaking is endothermic. Bond making is exothermic.
ΔH = ∑Dreactants - ∑Dproducts = ∑Dbroken - ∑Dformed
CH4 + Cl2 ➔ CH3Cl + HCl
ΔH = ?
| Bond Enthalpies (kJ/mol) | |
|---|---|
| C-H | 413 |
| C-Cl | 328 |
| H-Cl | 431 |
| Cl-Cl | 242 |
N2H4 + O2 ➔ N2 + 2H2O
ΔH = ?
| Bond Enthalpies (kJ/mol) | |
|---|---|
| N-H | 391 |
| O-H | 463 |
| O=O | 495 |
| N-N | 163 |
| N≡N | 941 |