Gce Model Questions Vol1 2025 Chemistry Question 16
Practice objective / multiple choice question 16 from the 2025 Gce Model Questions Vol1 Chemistry examination.
The standard enthalpies of formation of nitrogen oxides are: \(\Delta_f H^\circ(\text{NO}) = +90.3\ \text{kJ mol}^{-1}\), \(\Delta_f H^\circ(\text{N}_2\text{O}) = +82.0\ \text{kJ mol}^{-1}\), and \(\Delta_f H^\circ(\text{NO}_2) = +33.2\ \text{kJ mol}^{-1}\). Using the bond dissociation energies \(D(\text{N}\equiv\text{N}) = 945\ \text{kJ mol}^{-1}\) and \(D(\text{O}=\text{O}) = 498\ \text{kJ mol}^{-1}\), determine the average N=O double‑bond enthalpy in \(\text{NO}_2\).
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This is Gce Model Questions Vol1 2025 Chemistry Question 16. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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