PP Presentation
- Given by D - the bond dissociation energy
D = energy required to break a bond in a gas phase
molecule under standard conditions
e.g. CH4 (g) ® C (g) + 4 H (g)
DHrxn = -1664 kJ = 4 * D(C-H)
D(C-H) = 416 kJ per mole of C-H bonds
- D (C-H) (kJ/mol) varies slightly among compounds :
CH4 416 C2H6 392 C3H8 380
C2H4 432 C2H2 445 C6H6 448
Bond Energies (Kotz, sect. 9.4, pp 418-422)
- D can be derived from DHrxn for atomization . . .