Chemistry

Chemistry

Problem

The overall reaction X+2 Y→products\mathrm{X + 2\,Y \rightarrow \text{products}} has the experimentally determined rate law rate=k[X][Y]2.\text{rate}=k[\mathrm{X}][\mathrm{Y}]^{2}. Which of the following proposed mechanisms, each with its first step as the rate-determining step, is most consistent with the observed rate law? a) (i) X+Y→I  (slow)\mathrm{X + Y \rightarrow I}\; (\text{slow}) (ii) I+Y→products  (fast)\mathrm{I + Y \rightarrow products}\; (\text{fast}) b) (i) X+2 Y→I  (slow)\mathrm{X + 2\,Y \rightarrow I}\; (\text{slow}) (ii) I→products  (fast)\mathrm{I \rightarrow products}\; (\text{fast}) c) (i) 2 Y→I  (slow)\mathrm{2\,Y \rightarrow I}\; (\text{slow}) (ii) X+I→products  (fast)\mathrm{X + I \rightarrow products}\; (\text{fast}) d) (i) X+Y⇌I  (slow)\mathrm{X + Y \rightleftharpoons I}\; (\text{slow}) (ii) I+Y→products  (fast)\mathrm{I + Y \rightarrow products}\; (\text{fast})

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