Question

Why is ozone thermodynamically unstable?

Answer 1

Here the ΔG(gibb's free energy is the determining factor.The chemical species with +G is considered to be thermodynamically unstable with respect to its element & they have spontaneous tendency to decompose to its constituents elements.For ozone G for formation is +163KJ/mol have tendency to spontaneous decomposition at 25 C & is thermodynamically unstable.The equilibrium constant for formation of ozone is less than one.But it survives because the reaction of decomposition of ozone to O2 is very slow.

Answer 2

Hey !!

O₃ ⇄ O₂ + O       ΔH = -ve

Ozone being thermodynamically unstable therefore its decomposition is exothermic and its ΔS is +ve. So ΔG is always negative. High concentrations of ozone are dangerously explosive.

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