Elementary Principles 490 - 11.24 a. Energy balance: MCv dT...

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11- 19 11.24 a. Energy balance: MC dT dt QW v =− ±± ± ,. ± .. WC MQ W v == ° = 01 7 7 350 402 40 2 Jg C g, J s dT dt tT Tt ° U V | W | =+ =°⇒= 00649 02 0 20 0 0649 40 308 51 . , . .m i n Cs C s C s bg b. The benzene temperature will continue to rise until it reaches T b = ° 801 .C ; thereafter the heat input will serve to vaporize benzene isothermally. Time to reach neglect evaporation s b : . . = = 801 20 926 Time remaining: 40 minutes 60 s min s s −= 926 1474 Evaporation: Δ ² . H v 30 765 1000 393 kJ mol 1 mol 78.11 g J kJ J g b g b g Evaporation rate = = 40.2 J s 393 J g g s /. 0102 Benzene remaining = 350 0102 1474 200 g g s s g . b g c. 1. Used a dirty flask. Chemicals remaining in the flask could react with benzene. Use a clean flask. 2. Put an open flask on the burner. Benzene vaporizes toxicity, fire hazard. Use a covered container or work under a hood. 3. Left the burner unattended. 4. Looked down into the flask with the boiling chemicals. Damage eyes. Wear goggles. 5. Rubbed his eyes with his hand.
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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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