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12 Dec 2019

Given the following complex reaction mechanism for the reaction Br2(g) + Br2(g) â> 2 HBr (g): Br2 â> 2 Br* (rate constant ka), Br* + H2 â> HBr + H* (rate constant kb), H* + Br2 â> HBr + Br* (rate constant kc), H* + HBr â> H2 + Br* (rate constant kd), Br* + Be* â> Br2 (rate constant ke)

Which of the following is true?

(a)The rate constant for the termination step is ka.

(b)The steady-state approximation can be used to set the concentration

of [H] and [Br] to be constant.

(c)There are two propagation steps in this mechanism.

(d)The reaction kinetics will only depend on the last rate constant ke.

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Sixta KovacekLv2

13 Dec 2019

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