Need help finding #5 A The reaction between hydrogen and iodine to make hydrogen

Question

Need help finding #5 A The reaction between hydrogen and iodine to make hydrogen iodide has been found experimentally to be first order in each reactant: H_2 (g) + l_2 (g) rightarrow 2Hl (g) The following mechanism has been proposed for this reaction: Show that this mechanism is in agreement with the experimentally-determined rate law. Even though the proposed mechanism agrees with the rate law determined experimentally, there is something wrong with it, what is it? Rewrite the mechanism so that this problem goes away.

Explanation / Answer

correct mechanism

I2(g) <-----------------> I(g) + I(g)     (fast)

I(g) + H2(g) <----------------> IH2(g)    (fast)

IH2(g) + I(g) -----------------> 2HI(g)       (slow )

rate = k [H2][I2]

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