Final exam sample

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University of Waterloo
Chemical Engineering
CHE 100
Eric Croiset

ChE 100 Chemical Engineering Concepts 1 Final Examination Fall, 2000 December 7, 2000 9:00 a.m. – 12:00 Noon 3 hours Exam Type: Special Materials Aids Permitted Aids Not Permitted Felder and Rousseau Old exams and their solutions Conversion Tables Assignment solutions Course Notes Tutorial Quiz solutions Calculator Other Textbooks Student Name: _______________________________ K-Section: ____________ Student ID Number: ___________________ Instructions and Information 1. START EACH QUESTION ON THE QUESTION PAPER. If you need more space, there is a blank page at the end, or you can use the back of the page. If you prefer, you can ask for an exam booklet, and continue your solution in it. If you use an exam booklet, make sure you put your name and K-section on the front page. 2. All questions are required and are of equal mark value, though they may not be of equal difficulty. You should read the Question Paper and start with the easiest problem for you. 3. READ the question carefully to make sure you understand what you are being asked to do. Do not be afraid to ask questions: the worst that can happen is that I won’t answer. 4 Part marks are given for partial solutions which demonstrate an understanding of the concepts. Therefore, show all steps in your solution, and state any assumptions that you make. 5. Data not given in the problem statements can be found in Felder & Rousseau. 6. At the end of the examination, please remain seated until all exams have been collected. If you have used an exam booklet, put your question paper unfolded inside the exam booklet. If you detach any pages of the question paper, please make sure that your name is on each sheet so you get credit for it if the pages get mixed in with those of other students. Marking Scheme: Question Value Mark 1 20 2 20 3 20 4 20 5 20 TOTAL 100 Page 1 of 7 PROBLEM NO. 1 Synthesis gas for ammonia manufacture is fed to a reactor with N and 2 in sto2chiometric ratio. The N s2ream to the synthesis process which produces the synthesis gas contains argon in the ratio of 1 mol Ar/78 mol N . T2e single-pass conversion of the ammonia reactor is 23%. All the ammonia in the product stream is separated by condensation and the unreacted gas is recycled. From experiments, you found that, in order for the process to work properly, it is necessary to have a vent stream from the recycle line which amounts of 0.02 moles per mole of synthesis gas fed to the system. Determine: a) the mole percent argon in the fresh synthesis gas feed; b) the recycle/synthesis gas flow ratio; and c) the overall conversion for the process. __________________________________________________________________________________ Page
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