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Problem set # 2

Problem set # 2 - CHBE 241 Material and Energy Balances...

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CHBE 241 Material and Energy Balances Department of Chemical and Biological Engineering The University of British Columbia Problem Session #2 Tuesday, 26 September 2006, CHBE 101, 2–4pm 1. If air contains 79 mol% N 2 and 21 mol% O 2 , what is the mass (in grams) of 1 mol of air? What is the wt% N 2 and O 2 in air? 2. Your company needs an on-site storage of 60,000 lb ammonia. You decide to build a spherical vessel. What is the radius of the vessel needed if you store the ammonia (a) as gas at STP (b) as gas, at 80 F and 5 atm (c) as liquid at -30 F and 1 atm (d) as liquid at 80 F and 11 atm? Considering costs, safety, and operability, what temperature and pressure would you pick and why? (The density of liquid ammonia is 42.6 lb/ft 3 at -30 F and 37.5 lb/ft 3 at 80 F.) 3. Vinyl chloride (C 2 H 3 Cl) is used to make polyvinylchloride (PVC) for piping and other products. In the direct chlorination process, ethylene (C 2 H 4 ) and chlorine (Cl 2 ) are used as raw materials.
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