Nitric oxide and nitrogen dioxide are found in photochemical smog. Nitrogen diox

Question

Nitric oxide and nitrogen dioxide are found in photochemical smog. Nitrogen dioxide is formed from nitrogen monoxide in the exhaust of automobile engines. A possible mechanism for this reaction is given below, where equilibrium is quickly established in steps 1 and 2. What is the rate law predicted by this mechanism?

Reaction: 2NO(g) + O2(g) ? 2NO2(g)

Step 3 (slow): N + O2 ? NO

Nitric oxide and nitrogen dioxide are found in photochemical smog. Nitrogen dioxide is formed from nitrogen monoxide in the exhaust of automobile engines. A possible mechanism for this reaction is given below, where equilibrium is quickly established in steps 1 and 2. What is the rate law predicted by this mechanism? Reaction: 2NO(g) + O2(g) ? 2NO2(g) Step 1 (fast): NO + NO leftrightarrow N2O2 Step 2 (fast): N2O2 ! N leftrightarrow NO2 Step 3 (slow): N + O2 ? NO

Explanation / Answer

rate law is determined by slowest step

here, slowest step is N + O2---->NO

so, rate, r=k[N][O2]

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