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The heat of hydrogenation of cyclooctene is 97 kJ/mol. The heat of hydrogenation of cyclooctatetraene is 410 kJ/mol, more than four times the value for cyclooctene. The expected value for cyclooctatetraene (based on the value for cyclooctene) is 388 kJ/mol (4 x 97 kJ/mol).
The difference between the observed value and the expected value is the resonance stabilization energy, or -22 kJ/mol (388 kJ/mol - 410 kJ/mol). The negative sign indicating that full conjugation in cyclooctatetraene is destabilizing.
I am not certain how sign conventions are handled in this arena though.
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Adding energy at the natural frequency of an object is called what?
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