The decomposition of ozone, , is proposed to proceed via the mechanism: (fast, forward rate constant , backward ) and (slow, rate constant ). The correct rate law expression is:

Question

The decomposition of ozone, $2O_3 \rightarrow 3O_2$, is proposed to proceed via the mechanism: $O_3 \rightleftharpoons O_2 + O$ (fast, forward rate constant $k_1$, backward $k_{-1}$) and $O + O_3 \rightarrow 2O_2$ (slow, rate constant $k_2$). The correct rate law expression is:

Prashant Kotian · Accepted Answer

Correct answer: A. Rate is determined by the slow step: . Apply equilibrium to the fast step to substitute the intermediate : . Substituting this gives .

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