Typical bond energies in kcal/mol are 99 for C--H, 83 for C--C, and 146 for C==C. The

Question:

Typical bond energies in kcal/mol are 99 for C--H, 83 for C--C, and 146 for C==C. The heat of formation of gas-phase benzene from gas-phase hydrogen and carbon atoms is -1323 kcal/mol. Calculate the "experimental" delocalization energy of benzene using these data, first omitting the strain-energy correction (Prob. 17.9) and then including it. (Because bond energies vary from compound to compound, this procedure is very rough.)