Question

In Section 29-7, McQuarrie details the chain reaction between H2(g) and Br2(g). Consider the realted chain reaction H2(g) + Cl2(g) → 2HCl(g). The mechanism for this reaction is: Cl2(g) + Mg) = 2 Cl(g) +Mg) ki CI(g) + H2(g) → HCI(g) + H() k2 H(g) + Cl2(8) = HCI(g) + CI(8) k3 2Cl(g) + Mg) = Cl2(g) + Mg) ks (a) Use bond dissociation energies to explain why it is reasonable to exclude the analogous inhibition steps in this mechanism that are included in the mechanism for the chain reaction with Bra(g) H2 molecule Do/kJ mol! 432 HBr 363 НСІ 428 190 239 Br2 (b) Derive the rate law using the given mechanism.

Answer 1

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