11- 811.9 a.Balance on CO: Accumulation=-output NxnPRTnxPRTxdNxdtPRTxdxdtPNRTxPVNRTdxdtVxtxppppp()(±)±±)±±±±,.molmol CO / mol) = total moles of CO in the laboratoryMolar flow rate of entering and leaving gas: (kmolhRate at which CO leaves: (kmolhkmol COkmol= CO balance: Accumulation = -outputkmol COkmol=FHGIKJ=−⇒FHGIKJE===ν0001b.dxxVdttVxxptrpr0010100.±±lnzz⇒bgc.V=350 m3tr××=−350700100 35 102836ln.ejhrs 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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