Question
Explain why ozone is thermodynamically less stable than oxygen.
✓
Answer
Ozone is thermodynamically unstable with respect to oxygen since its decomposition into oxygen results in the liberation of heat ($\Delta\text{H}$ is negative) and an increase in entropy ($\Delta\text{S}$ is positive). These two effects reinforce each other, resulting in large negative Gibbs energy change ($\Delta\text{G}$) for its conversion into oxygen.
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