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Topological Resonance Energy of Very Large Benzenoid Hydrocarbons

Abstract An approximate expression is obtained for the resonance energy of benzenoid hydrocarbons. The resonance energy is shown to depend in a simple manner on the number of six-membered cycles and on the number of Kekule structural formulae of the molecule. By this approach, the resonance energies of very large benzenoid hydrocarbons can be determined.