Elementary Principles 482 - 11.13 a. Mass of isotope at any...

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11- 11 11.13 a. Mass of isotope at any time = VC liters mg isotope liter bg b g Balance on isotope: Accumulation = –consumption d dt VC kC V b g =− F H G I K J mg Ls L dC dt kC tC C == 0 0 , Separate variables and integrate dC C kdt C C kt t CC k C Ct 0 0 0 0 zz =− ⇒ F H G I K J =− ⇒ = ln ln t k t k =⇒ = ⇒= 05 2 01 2 . ln . ln 12 b. tk 1 26 2 0267 = = . ln . . hr hr hr = 001 0 . t = = ln . . 17.2 hr 11.14 A products a. Mole balance on A : Accumulation = –consumption dCV dt kC V A A V constant; cancels C dC C kdt C C kt C C kt AA A A C A A A A F H G I K J = 0 0 0 0 0 0 , ln exp b. Plot C A (log scale) vs. t (rect. scale) on semilog paper. The data fall on a straight line (verifies assumption of first-order) through A 213 0 0262 ., . & A 120 0 0 0185 . . ln ln ln . . .. Ck t C kk =− + −= × ⇒ =
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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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