Consider the overall reaction: Cl_2 (aq)+H_2S (aq)--> S (s) +2HCl (aq). A proposed mechanism is  Cl_2-->Cl^++Cl^-  (slow) Cl^-+H_2S-->HCl+HS^-  (fast) Cl^++HS^- -->HCl+S   (fast) If this is the correct mechanism, which is the predicted rate expansion? i.) rate = k[Cl^+][Cl^-] ii.) rate = k[Cl_2][H_2S] iii.) rate = k[S][HCl]^2 iv.) rate = k[Cl_2]

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
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Consider the overall reaction: Cl_2 (aq)+H_2S (aq)--> S (s) +2HCl (aq). A proposed mechanism is 

Cl_2-->Cl^++Cl^-  (slow)

Cl^-+H_2S-->HCl+HS^-  (fast)

Cl^++HS^- -->HCl+S   (fast)

If this is the correct mechanism, which is the predicted rate expansion?

i.) rate = k[Cl^+][Cl^-]

ii.) rate = k[Cl_2][H_2S]

iii.) rate = k[S][HCl]^2

iv.) rate = k[Cl_2]

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