Question

Explain why ozone is thermodynamically less stable than oxygen.


NCERT Class XII
Chemistry - Exemplar Problems

Chapter 7. The p-block elements

Answer 1

Thank you for the question!
Ozone is thermodynamically less stable than oxygen because its decomposition into oxygen results in the liberation of heat. Ozone consists of three molecules of oxygen and thus in this its in unstable state so in order to get stable it gives up its one molecule of oxygen to restore diatomic state. Eventually, in all thus process large amount of heat is released.
Hope it helps. 

Answer 2

Hey !!

Since formation of ozone from oxygen is endothermic, therefore O₃ is thermodynamically less stable than O₂

   3 O₂ ⇄ (Silent electric discharge) 2 O₃ (g) ; ΔH° (298 K) = + 142 kJ mol⁻¹

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