5_60_lecture33

5_60_lecture33 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #33 page 1 Complex Reactions and Mechanisms (continued) IV) Chain Reactions Where a product from a step in the mechanism is a reactant for a previous step (i.e. the reaction feeds itself). a) Stationary or stable chain reactions. The concentration of reactive intermediates is constant in time or slowly decreasing. Example: CH 3 CHO CH 4 + CO Experimental observations: Small amounts of C 2 H 6 and H 2 are also produced, and the Rate of Reaction [CH 3 CHO] 3/2 . (These are signatures of a chain reaction mechanism)
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5.60 Spring 2008 Lecture #33 page 2 Proposed mechanism for this reaction: k 1 Initiation: CH 3 CHO CH 3 + CHO k 2 Propagation: CH 3 + CH 3 CHO CH 3 CO + CH 4 k 3 CH 3 CO CH 3 + CO Termination: 2 CH 3 k 4 C 2 H 6 k 5 “Side” Reactions: CHO
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5_60_lecture33 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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