A proposed mechanism for the gas-phase reaction is shown below

CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics

Problem

A proposed mechanism for the gas-phase reaction 2 NO+Cl2→2 NOCl2\,\text{NO}+\text{Cl}_{2}\rightarrow 2\,\text{NOCl} is shown below. Step 1 NO ++ Cl2_2 ⟶\longrightarrow NOCl2_2 (slow) Step 2 NOCl2_2 ++ NO ⟶\longrightarrow 2 NOCl (fast) Which of the following rate laws is most consistent with this mechanism? (a) rate =k[NO]2[Cl2]=k[\text{NO}]^{2}[\text{Cl}_{2}] (b) rate =k[NO][Cl2]=k[\text{NO}][\text{Cl}_{2}] (c) rate =k[NO]2=k[\text{NO}]^{2} (d) rate =k[NO][NOCl2]=k[\text{NO}][\text{NOCl}_{2}]

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