Experimental studies show that the reaction obeys the rate law Which of the following…

CHEMISTRY · Single correct · A Level · Chemistry · Rate equations · Rate equations

Problem

Experimental studies show that the reaction 2 H2(g)+Cl2(g)→2 HCl(g)2\,\text{H}_2(g) + \text{Cl}_2(g) \rightarrow 2\,\text{HCl}(g) obeys the rate law rate=k[H2][Cl2]1/2\text{rate} = k[\text{H}_2][\text{Cl}_2]^{1/2} Which of the following proposed mechanisms is (are) consistent with this rate law? Mechanism I Step 1: Cl2(g)⇌2 Cl(g)\text{Cl}_2(g) \rightleftharpoons 2\,\text{Cl}(g) (fast) Step 2: H2(g)+Cl(g)→H2Cl(g)\text{H}_2(g) + \text{Cl}(g) \rightarrow \text{H}_2\text{Cl}(g) (slow) Step 3: H2Cl(g)+Cl(g)→2 HCl(g)\text{H}_2\text{Cl}(g) + \text{Cl}(g) \rightarrow 2\,\text{HCl}(g) (fast) Mechanism II Step 1: H2(g)+Cl2(g)→2 HCl(g)\text{H}_2(g) + \text{Cl}_2(g) \rightarrow 2\,\text{HCl}(g) (slow, elementary) (a) Mechanism II only (b) Both Mechanisms I and II (c) Mechanism I only (d) Neither Mechanism I nor II

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