After your selection in a if more than one mechanism is still plausible propose

Question

After your selection in a if more than one mechanism is still plausible propose possible experiment that could help determine which of the remaining mechanisms might be further validated The macro rate law for conversion of nitrogen monoxide from auto exhausts into the brown smog pollutant nitrogen dioxide, 2 NO (g) + O2 (g) 2 NO2 (g) is: rate-k[NOF [02] Six mechanisms proposed. Whenappears, means elementary step is an equilibrium reaction: Mech A NO (g) + NO (g) N2O2 (g) fast slow fast fast slow slow fast slow fast O2 (g) N2O2 (g) NO (g) + O (g) NO2 (g) + NO (g) N2O3 (g) N2O3 (g) + 0(g) 2NO2(g) NO(g) NO (g) 2 NO (g) NO2 (g)+ N (g) N (g) NO (g) NO3(g) 2 NO (g) + O2(g) + 2NO2 (g) Mech B NO2 (g) NO2 (g) NO2 (g) O(g) O2 (g) 0(g) Mech C + + + Mech D O2 (g) NO2 (g) + N03 (g) fast O2 (g) NO (g) + Mech E 2 NO2 (g) slow + Mech F 2NO2(g) (o) Which of these mechanisms can be eliminated as being viable, and explain your reasoning for each

Explanation / Answer

2NO +O2 ------> 2NO2

Rate = K[NO]2[O2]

Rate of reaction depends upon slowest step . So slowest step is called rate determing step.

2NO --------> NO2 + N slow    

N + O2 ------> NO2 fast step

rate = K [NO]2     D answer

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