Cl 2 (g) 2Cl(g) Cl(g) +CHCl 3 HCl(g) + CCl 3 (slow) CCl 3 + Cl(g) CCl 4 (g) (fas

Question

Cl2(g) 2Cl(g) Cl(g) +CHCl3 HCl(g) + CCl3 (slow) CCl3 + Cl(g) CCl4(g) (fast)
Which of the followingare true statements for the above mechanism ? There maybe be morethan one correct statement. a) The overall rate law is equal to the rate law ofthe second step
as it appears above b) k1[Cl2] = k-1[Cl]2 c) Cl(g) does not appear in the overall reaction d) Ifthis is a correct mechanism the observed law would be
Rate = k[Cl2]1/2[CHCl3] CCl3 + Cl(g) CCl4(g) (fast)
Which of the followingare true statements for the above mechanism ? There maybe be morethan one correct statement.

Explanation / Answer

Cl2(g) 2Cl(g) Cl(g) + CHCl3 HCl(g) +CCl3 (slow)                      CCl3+ Cl(g) CCl4(g) (fast) a) The overall rate law is equal to the rate law of thesecond step
as it appears above   Overall rate law is equal to rate law of second step as the first step is the slowest step. This istrue.
b) k1[Cl2] = k-1[Cl]2 For the reaction, Cl2(g) 2Cl(g)
k1 is the rate of the forward reaction and k -1 is the rate ofbackward reaction For the reaction, Cl2(g) 2Cl(g)
k1 is the rate of the forward reaction and k -1 is the rate ofbackward reaction This is true. c) Cl(g) does appear in the overallreaction   So this is false. d) If this is a correct mechanism the observed law would be
Rate = k[Cl2]1/2[CHCl3] The rate law of the slowest step contains [Cl]2 and not [Cl2] 1/2 So this is false. So a, b are true.

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