CHBE 241 Material and Energy Balances Department of Chemical and Biological Engineering The University of British Columbia Assignment 4 Due: Monday, 3 November 2008, 4:30pm CHBE Main Ofﬁce 1. 1 mol methane (CH 4 ) is burned with 3 mol oxygen to form carbon dioxide and water. Which reactant is limiting? What is the percent excess of the other reactant? 2. 100 mol each of A and B are fed to a reactor. Two reactions take place: 2A + B = C + D, and A + C = E. C is the desired product and A is the expensive reactant. If f CA =0 . 60 and f CC =0 . 25, what is the yield and selectivity for producing C from A? Check your answer by conﬁrming that yield = conversion × selectivity. 3. Your company is interested in building a plant to make ibuprofen, using the reaction scheme described in your textbook (Example 4.1). Your job is to measure the reaction rate with different catalysts, as a ﬁrst step in designing a full-scale reactor. In one experiment, you mix 134 g isobutylbenzene (IBB, C 10 H 14
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