Homework+5 - Chemical Engineering 142 Homework Set #5 100...

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Chemical Engineering 142 Homework Set #5 100 points total Due Wednesday, February 24, 2010 Problem 1 (50 points) Consider a gas-phase reaction that occurs via the following sequence of elementary steps: A k 1  → A k 1 = 0.44 s -1 A +A k 2  → B +C k 2 = 1.6 L -1 mol -1 s -1 so that the overall reaction is 2A B + C (a) Derive the rate expression for the rate of production of product B in terms of rate constants and concentrations of measurable species by applying the pseudo steady-state hypothesis (PSSH) for all reactive intermediates. (b) Determine the steady-state concentration of A, C AS , in a CSTR (400 L) with a feed of pure A (0.1 L s -1 ) and inlet concentration, C A0 , of 2 mol L -1 . (c) Starting with the general mole balance, derive the ordinary differential equation that describes the transient concentration of A during CSTR start-up, solely in terms of reaction rate constants, τ , and C A0 . (d) Initially, the CSTR contains only inert gas molecules, I, and is fed an inert gas stream
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This note was uploaded on 01/23/2011 for the course CHM 142 taught by Professor Hey during the Spring '10 term at University of California, Berkeley.

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Homework+5 - Chemical Engineering 142 Homework Set #5 100...

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