Quiz_4_ - k i is the forward rate constant for reaction i k...

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1 ± CHE 431 Chemical Reaction Engineering Fall 2007 (10/19/06) Quiz 4 PID:______________________________ 1) ( 20 points ) Ethane pyrolysis follows this mechanism: C 2 H 6 Æ 2 CH 3 · Initiation (1) CH 3 · + C 2 H 6 = Æ CH 4 + C 2 H 5 · Propagation (minor) (2) C 2 H 5 · Æ H · + C 2 H 4 Propagation (major) (3) H · + C 2 H 6 Æ H 2 + C 2 H 5 · Propagation (major) (4) C 2 H 5 · + C 2 H 5 · Æ C 4 H 10 Termination (major) (5) (combination) C 2 H 5 · + C 2 H 5 · Æ C 2 H 4 + C 2 H 6 Termination (minor) (6) (disproportionation) Find the rate expression for the formation of ethene, C 2 H 4 .
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2 ± 2) ( 20 points ) It is observed that substrate inhibition occurs in the following enzymatic reaction: (1) E + S = ES k 1 , k 1 , K 1 = k 1 / k 1 (2) ES + S = SES k 2 , k 2 , K 2 = k 2 / k 2 (3) ES Æ P + E k 3 K i is the equilibrium constant for reaction i
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Unformatted text preview: k i is the forward rate constant for reaction i k i is the reverse constant for reaction i r p = d[P]/dt Each step is considered an elementary reaction. Derive an expression for r p using a) the pseudo steady state approximation b) the pre-equilibrium assumption c) when will the expressions in a) and b) equal each other? 3 3) ( 10 points ) (a) In the following equation what does V max signify: r S = [V max (S) / [K M + (S)] (b) In the following plots, indicate whether the plots represent uncompetitive, noncompetitive, or competitive inhibition....
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Quiz_4_ - k i is the forward rate constant for reaction i k...

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