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Unformatted text preview: CE 561, Exam 2, December 11, 2009 This exam consists of four questions, including three with multiple parts. You should be careful not to get stuck on one part. If you do not know how to do a problem, move on and return to it if you have time at the end. If you cannot find the numerical answer to a problem, explain how you would find the answer if you had more time. You may use three pages (2-sided) of hand-written notes and a scientific calculator. You should not have formulas pre-stored in your calculator. Carefully explain any assumptions you make, clearly indicate what part of what problem you are working on, and define the symbols that you use. The point value of each sub-part is indicated – budget your effort accordingly. There are 100 points total. Good luck. 1. The reversible, exothermic reaction A ↔ B, with rate = k 1 C A – k 2 C B is to be carried out in solution in a well-mixed adiabatic batch reactor. At the start of each batch, the reactor contains 100 L of a solution of A at a concentration of 5 mol per liter ( C Ao = 5 mol/L, C Bo = 0) and a temperature of 300 K. Emptying, cleaning, and re-filling the reactor between batches requires 2 hours. The reactor contents have a density of 1 kg per liter and a specific heat of 4200 J/(kg K). The enthalpy of reaction is -42 kJ/mol. The liter and a specific heat of 4200 J/(kg K)....
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This document was uploaded on 07/08/2011.
- Fall '09