Abstract
An experimental determination of heats of atomization of some ortho-substituted benzoic acids has been performed by combustion and differential scanning calorimetry. Resonance energy was calculated by the difference between the heat of atomization in the gas phase and the sum of the bond energies of a fixed bond structure for a resonating molecule. As the van der Waals radii of the ortho-substituent increased a decrease in resonance energy was observed.
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