The best estimate for the bond dissociation energy of cyclopentane obtainable from the BDE table is +95 kcal/mol for a secondary radical. Bonds that are broken are endothermic processes (+DH^o) while bonds that are formed are exothermic (-DH^o). The sum of the 2 propagation steps gives the DH_rxn, -30 kcal/mol.

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