Homework+3-1 - Chemical Engineering 142 Homework Set #3 100...

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Chemical Engineering 142 Homework Set #3 100 points total Due Wednesday, February 10, 2010 Problem 1 (30 points) Consider the following gas phase reaction for the formation of formaldehyde: CO +H 2 HCHO r = k f C CO C H 2 k r C HCHO k f k r = K c Where K C is the equilibrium constant for the reaction in terms of concentration, and k f and k r are rate constants. For the forward reaction the activation energy is equal to 10 kJ/mol, and the pre- exponential factor (A) is equal to 1 L/mol-s. Consider all gas phase species ideal. The following table shows how K P varies with temperature: Temperature (K) K P (bar -1 ) 700 1.509 800 1.498 900 1.489 1000 1.482 1100 1.477 a) The temperature dependence of the reaction is given by the van’t Hoff equation: d ln K P ( ) dT = Δ H RX RT 2 Based on this expression, determine if the reaction is endothermic or exothermic. Compute the value of K P at 950 K (neglect any dependence of Δ H RX on temperature). b)
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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+3-1 - Chemical Engineering 142 Homework Set #3 100...

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