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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