Determine the rate law for the reaction: C2H4Br2 + 3KI → C2H4 + 2KBr +KI3, given the initial rate data below?

[C2H4Br2], M [KI], M Δ[KI3]/Δt (M min-1)

    0.500 1.80 0.269

    0.500 7.20 1.08

    1.50 1.80 0.807

a. 

rate = k[KI]2

 b. 

rate = k[KI]

 c. 

rate = k[C2H4Br2]

 d. 

rate = k[KI][C2H4Br2]

 e. 

rate = k[KI][C2H4Br2]2

1 Answer

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  • 1 month ago

    Comparing reactions 1 and 3, you see that increasing the concentration of C2H4Br2 3-fold increases the rate of the reaction 3-fold, so the reaction is 1st order. So, the reaction is first order with respect to [C2H4Br2]

    Comparing reactions 1 and 2, you see that increasing the concentration of KI 4-fold, increases the rate of the reaction 4-fold. So, the reaction is also first order with respect to [KI].

    d. rate = k[KI][C2H4Br2]

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