Elementary Principles 479 - 11.9 a Balance on CO...

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11- 8 11.9 a. Balance on CO : Accumulation=-output N x n P RT nx P RT x dN x dt P RT x dx dt P NRT x PV NRT dx dt V x tx p p p p p () ( ± ) ± ± ) ± ± ± ± ,. mol mol CO / mol) = total moles of CO in the laboratory Molar flow rate of entering and leaving gas: ( kmol h Rate at which CO leaves: ( kmol h kmol CO kmol = CO balance: Accumulation = -output kmol CO kmol = F H G I K J =− F H G I K J E = == ν 00 0 1 b. dx xV dt t V x x p t r p r 001 0 100 . ± ± ln z z bg c. V = 350 m 3 t r × × = 350 700 100 35 10 283 6 ln . ej hrs d. The room air composition may not be uniform, so the actual concentration of CO in parts of the room may still be higher than the safe level. Also, “safe” is on the average; someone could be particularly sensitive to CO. Precautionary steps : Purge the laboratory longer than the calculated purge time. Use a CO detector
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