Calculate the magnitude of resonance energy of from the following data (in kJ/mol): Bond energies: C=O = 539.0, O=O = 498.0; Heat of sublimation of C(s) = 718.0; Heat of combustion of C(s) = -393.0

Question

Calculate the magnitude of resonance energy of $CO_2$ from the following data (in kJ/mol): Bond energies: C=O = 539.0, O=O = 498.0; Heat of sublimation of C(s) = 718.0; Heat of combustion of C(s) = -393.0

Prashant Kotian · Accepted Answer

Correct answer: B. Theoretical formation: δ H = sub_H(C) + BE(O=O) - 2*BE(C=O) = 718 + 498 - 2*539 = +138 kJ/mol. Actual delta_f H = -393 kJ/mol. Resonance energy = 138 - (-393) = 531 kJ/mol.

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