Bond Strength

• Bond Dissociation energy (DE) - energy required to break a bond in gas phase.

• See Table 9.5

BOND STRENGTH (kJ/mol) LENGTH (pm)

H—H 436 74

C—C 347 154

C=C 611 134

CºC 837 121

NºN 946 110

The GREATER the number of bonds (bond order)

the HIGHER the bond strength and the SHORTER the bond.

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