In Section 18.4 we considered the following mechanism for the reaction of Br, with H;: Br2 + M 2 Br + Br + M k- Br + H2 HBr + H H + Br2 HBr + Br Although this is adequate for calculating the initial rate of reaction, before product HBr builds up, there is an additional process that can participate as the reaction continues: HBr + H H2 + Br (a) Write an expression for the rate of change of [H]. (b) Write an expression for the rate of change of [Br]. (c) As hydrogen and bromine atoms are both short-lived species, we can make the steady-state approximation and set the rates from parts (a) and (b) to 0. Express the steady-state concentrations [H] and [Br] in terms of concentrations of H, Br2, HBr, and M. [Hint: Try adding the rate for part (a) to that for part (b).] (d) Express the rate of production of HBr in terms of соncеnraions of H, Brz, HB, аnd M.
In Section 18.4 we considered the following mechanism for the reaction of Br, with H;: Br2 + M 2 Br + Br + M k- Br + H2 HBr + H H + Br2 HBr + Br Although this is adequate for calculating the initial rate of reaction, before product HBr builds up, there is an additional process that can participate as the reaction continues: HBr + H H2 + Br (a) Write an expression for the rate of change of [H]. (b) Write an expression for the rate of change of [Br]. (c) As hydrogen and bromine atoms are both short-lived species, we can make the steady-state approximation and set the rates from parts (a) and (b) to 0. Express the steady-state concentrations [H] and [Br] in terms of concentrations of H, Br2, HBr, and M. [Hint: Try adding the rate for part (a) to that for part (b).] (d) Express the rate of production of HBr in terms of соncеnraions of H, Brz, HB, аnd M.
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter18: Chemical Kinetics
Section: Chapter Questions
Problem 53AP
Related questions
Question
![In Section 18.4 we considered the following mechanism
for the reaction of Br, with H;:
Br2 + M 2 Br + Br + M
k-
Br + H2
HBr + H
H + Br2
HBr + Br
Although this is adequate for calculating the initial rate
of reaction, before product HBr builds up, there is an
additional process that can participate as the reaction
continues:
HBr + H
H2 + Br
(a) Write an expression for the rate of change of [H].
(b) Write an expression for the rate of change of [Br].
(c) As hydrogen and bromine atoms are both short-lived
species, we can make the steady-state approximation
and set the rates from parts (a) and (b) to 0. Express
the steady-state concentrations [H] and [Br] in terms
of concentrations of H, Br2, HBr, and M. [Hint: Try
adding the rate for part (a) to that for part (b).]
(d) Express the rate of production of HBr in terms of
соncеnraions of H, Brz, HB, аnd M.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb5695163-0556-4357-96f2-8d772711af54%2F16af8cd0-9c82-4d81-a64d-72691efd4965%2Fim7gw2a.png&w=3840&q=75)
Transcribed Image Text:In Section 18.4 we considered the following mechanism
for the reaction of Br, with H;:
Br2 + M 2 Br + Br + M
k-
Br + H2
HBr + H
H + Br2
HBr + Br
Although this is adequate for calculating the initial rate
of reaction, before product HBr builds up, there is an
additional process that can participate as the reaction
continues:
HBr + H
H2 + Br
(a) Write an expression for the rate of change of [H].
(b) Write an expression for the rate of change of [Br].
(c) As hydrogen and bromine atoms are both short-lived
species, we can make the steady-state approximation
and set the rates from parts (a) and (b) to 0. Express
the steady-state concentrations [H] and [Br] in terms
of concentrations of H, Br2, HBr, and M. [Hint: Try
adding the rate for part (a) to that for part (b).]
(d) Express the rate of production of HBr in terms of
соncеnraions of H, Brz, HB, аnd M.
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