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