Elementary Principles 119 - 5.19 (cont'd) c. With the room...

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5- 7 5.19 (cont’d) c. With the room closed off all weekend and the valve to the liquid cylinder leaking, if a person entered the room and closed the door, over a period of time the person could die of asphyxiation. Measures that would reduce hazards are: 1. Change the lock so the door can always be opened from the inside without a key. 2. Provide ventilation that keeps air flowing through the room. 3. Install a gas monitor that sets off an alarm once the mole% reaches a certain amount. 4. Install safety valves on the cylinder in case of leaks. 5.20 n kg 1 kmol 44.01 kg kmol CO CO 2 2 == 157 0 357 . . Assume ideal gas behavior, negligible temperature change T C K =°= 19 292 2 . bg a. PV nRT n0 . 3 5 7 R T n n 0.357 P P 102kPa 3.27 10 kPa n kmol air in tank 1 2 1 1 1 1 1 2 3 = + + × ⇒= 1 0 0115 . b. V P 0.0115 kmol 292.2 K 8.314 m kPa 102kPa kmol K L m L tank 1 1 3 3 = 10 274 3 ρ f 2 g CO +11.5 mol air (29.0 g air / mol) 274 L g/L = = 15700 585 . c. CO 2 sublimates large volume change due to phase change rapid pressure rise. Sublimation causes temperature drop; afterwards, T gradually rises back to room
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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