Which of the following molecules will have different values of standard molar enthalpy of formation, — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

The bond energy concept strictly assumes localized bonds. Molecules possessing significant resonance stabilization (electron delocalization), such as 1,3-Butadiene and $\text{N}_2\text{O}$, will exhibit experimentally lower (more stable) enthalpies of formation calorimetrically than standard localized bond predictions.