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The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine: 1) Cl2...

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Chemistry

The following mechanism has been proposed for the gas-phasereaction of chloroform (CHCl3) and chlorine:
1) Cl2 ⇔ 2 Cl (fast, reversible)
2) Cl + CHCl3 → HCl + CCl3 (slow)
3) Cl + CCl3 → CCl4 (fast)
What rate law does this mechanism predict? Choose from the listbelow and enter the letters for all the terms needed in the ratelaw. (So for a rate law of k[Cl2] enter AC, and for arate law of k[Cl2][CHCl3] enter ACE.)

A. kG. [Cl]1/2M. [Cl2]2
B. [HCl]H. [CHCl3]1/2N. [Cl]2
C. [Cl2]I. [CCl3]1/2O. [CHCl3]2
D. [Cl]J. [HCl]1/2P. [CCl3]2
E. [CHCl3]K. [Cl2]1/2
F. [CCl3]L. [HCl]2

Answer & Explanation Solved by verified expert
4.2 Ratings (579 Votes)

From the given data -

For the first step: Keq = [Cl]2 / [Cl2]                ..... (1)

Rate determing step is second step: rate law = k [Cl][CHCl3]    ..... (2)

From equation:1    [Cl] = [ Keq*[Cl2] ]1/2

If we substitute this in equation:2)

                              rate law = k [ Keq*[Cl2] ]1/2 [CHCl3]

                                           = k (Keq)1/2 [Cl2]1/2 [CHCl3]

If we write whole k' = k (Keq)1/2

Rate law = k' [Cl2]1/2 [CHCl3]

Thus answer is AKE

       
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