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The Relationship between Stoichiometry and Kinetics

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Sidney Toby

Department of Chemistry, Rutgers University, Piscataway, NJ 08854

J. Chem. Educ., 2000, 77 (2), p 188

DOI: 10.1021/ed077p188

Publication Date (Web): February 1, 2000

Section:

History, Education, and Documentation

Abstract

A mechanism consisting of several elementary steps may not have a unique stoichiometry. Even if one exists, a linear combination of the steps will not in general lead to a correct formulation of the overall stoichiometry. We consider the time dependence of stoichiometry and show how it can be obtained. A linear combination of the rate expressions for the steps, together with the use of the steady-state assumption for the concentration of reactive intermediates, will lead to an unambiguous expression for the time-dependent stoichiometry of the system.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Subject):

Kinetics

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Citing Articles

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This article has been cited by 6 ACS Journal articles (5 most recent appear below).

Does a Photochemical Reaction Have a Kinetic Order?
Sidney Toby
Journal of Chemical Education2005 82 (1), 37
- Does a Photochemical Reaction Have a Kinetic Order?
  Sidney Toby
  Journal of Chemical Education2005 82 (1), 37
  There are anomalies associated with the characterization of photochemical reactions in terms of rate constants.
  Abstract | Hi-Res PDF | PDF w/ Links
Does a Photochemical Reaction Have a Kinetic Order? (the author replies)
Michael Hippler
Journal of Chemical Education2005 82 (1), 37
- Does a Photochemical Reaction Have a Kinetic Order? (the author replies)
  Michael Hippler
  Journal of Chemical Education2005 82 (1), 37
  Light absorption in photochemistry can be described by standard kinetic concepts, without inconsistencies or anomalies.
  Abstract | Hi-Res PDF | PDF w/ Links
Reactions (→) vs Equations (=)
S. R. Logan
Journal of Chemical Education2003 80 (11), 1258
- Reactions (→) vs Equations (=)
  S. R. Logan
  Journal of Chemical Education2003 80 (11), 1258
  Commentary on the distinction between chemical reactions and equations.
  Abstract | Hi-Res PDF | PDF w/ Links
Mass Conservation Implications of a Reaction Mechanism
Ronald W. Missen , William R. Smith
Journal of Chemical Education2003 80 (7), 833
- Mass Conservation Implications of a Reaction Mechanism
  Ronald W. Missen , William R. Smith
  Journal of Chemical Education2003 80 (7), 833
  A proposed reaction mechanism in chemical kinetics contains implications for mass-conservation equations (stoichiometry) governing the reacting system. The only information required to determine the number and a particular set of these equations is the ...
  Abstract | Hi-Res PDF | PDF w/ Links
What Is the Overall Stoichiometry of a Complex Reaction?
Sidney Toby and Irwin Tobias
Journal of Chemical Education2003 80 (5), 520
- What Is the Overall Stoichiometry of a Complex Reaction?
  Sidney Toby and Irwin Tobias
  Journal of Chemical Education2003 80 (5), 520
  The overall stoichiometry of a reaction having a multistep mechanismcan be derived using methods based on either of the following twoapproaches: elemental-balance or extent of reaction. The extent ofreaction method (ξ method) has been used for many years. ...
  Abstract | Hi-Res PDF | PDF w/ Links