431_7_ - 3 is a participant in some other known reactions...

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MICHIGAN STATE UNIVERSITY CHE 431 Chemical Reaction Engineering Fall 2007 Homework 7 Due Oct. 17, 2007 1) The gas-phase homogenous oxidation of nitrogen monoxide (NO) to dioxide (NO 2 ), k 2NO + O 2 Æ 2NO 2 is known to have a form of third-order kinetics which suggest that the reaction is elementary as written, at least for low partial pressures of the nitrogen oxides. However, the rate constant k actually decreases with increasing absolute temperature, indicating an apparently negative activation energy. Because the activation energy of any elementary reaction must be positive, some explanation is in order. Provide an explanation, starting from the fact that an active intermediate species, NO
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Unformatted text preview: 3 , is a participant in some other known reactions that involve oxides of nitrogen. 2) Applying the pseudo steady-state approximation to the mechanism provided in class for: H 2 + Br 2 Æ 2 HBr What is the rate expression for the production of HBr? Obtain an expression for the intermediates, H and Br radicals as a function of the measurable quantities. At low conversion, the inhibition step may be neglected, in which case, what is the rate expression for the production of HBr? 3) Folger problem 7-10 (a-c), p. 460. Derive the rate laws for the following enzymatic using the pre-equilibrium to develop the rate laws. 4) Folger problem 7-11 (a,b), p. 460...
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