Consider the unimolecular reaction, CH3NC(g) = CH3NC(g), carried out in the presence of a helium buffer gas. The collision of a CH3NC molecule with either another CH3NC molecule or a helium atom can energize the molecule thereby leading to reaction. If the energizing reactions involving a CH3NC molecule and a He atom occur with different rates, the reaction mechanism would be given by CH3NC(g) + CH3NC(g) CH3NC*(g) + CH3NC(g) CH³NC(g) + He(g) — * — CH³NC*(g) + He(g) k3 CH3NC* (g) CH3CN(g) Apply the steady-state approximation to the intermediate species, CH3NC*, to show that k3(k₁[CH3NC]²+ k₂ [CH3NC] [He]) k₁[CH3NC] + k½ [He] + k3 rate = k₂ d[CH3CN] dt
Consider the unimolecular reaction, CH3NC(g) = CH3NC(g), carried out in the presence of a helium buffer gas. The collision of a CH3NC molecule with either another CH3NC molecule or a helium atom can energize the molecule thereby leading to reaction. If the energizing reactions involving a CH3NC molecule and a He atom occur with different rates, the reaction mechanism would be given by CH3NC(g) + CH3NC(g) CH3NC*(g) + CH3NC(g) CH³NC(g) + He(g) — * — CH³NC*(g) + He(g) k3 CH3NC* (g) CH3CN(g) Apply the steady-state approximation to the intermediate species, CH3NC*, to show that k3(k₁[CH3NC]²+ k₂ [CH3NC] [He]) k₁[CH3NC] + k½ [He] + k3 rate = k₂ d[CH3CN] dt
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter11: Chemical Kinetics: Rates Of Reactions
Section: Chapter Questions
Problem 118QRT
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![Consider the unimolecular reaction, CH3NC(g) ⇒ CH3NC(g), carried out in the presence of a helium buffer gas.
The collision of a CH3NC molecule with either another CH3NC molecule or a helium atom can energize the
molecule thereby leading to reaction. If the energizing reactions involving a CH3NC molecule and a He atom
occur with different rates, the reaction mechanism would be given by
CH3NC(g) + CH3NC(g)
CH3NC*(g) + CH3NC(g)
CH3NC(g) + He(g)
k3
CH3NC* (g) → CH3CN(g)
rate =
K₂
k₂
d[CH3CN]
dt
k₁
Apply the steady-state approximation to the intermediate species, CH3NC*, to show that
k3(k1₁[CH3NC]² + k₂[CH3NC][He])
k{[CH3NC] + k½[He] + k3
CH3NC*(g) + He(g)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5cf787c2-6f6a-44c6-a9e4-1d29c994970c%2F2357681d-249f-4979-abbb-c9ba9e520b29%2Fsqt689_processed.png&w=3840&q=75)
Transcribed Image Text:Consider the unimolecular reaction, CH3NC(g) ⇒ CH3NC(g), carried out in the presence of a helium buffer gas.
The collision of a CH3NC molecule with either another CH3NC molecule or a helium atom can energize the
molecule thereby leading to reaction. If the energizing reactions involving a CH3NC molecule and a He atom
occur with different rates, the reaction mechanism would be given by
CH3NC(g) + CH3NC(g)
CH3NC*(g) + CH3NC(g)
CH3NC(g) + He(g)
k3
CH3NC* (g) → CH3CN(g)
rate =
K₂
k₂
d[CH3CN]
dt
k₁
Apply the steady-state approximation to the intermediate species, CH3NC*, to show that
k3(k1₁[CH3NC]² + k₂[CH3NC][He])
k{[CH3NC] + k½[He] + k3
CH3NC*(g) + He(g)
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