Chloropicrin (MW 164.4) is stored in a 55 gallon drum in a 200 ft X 150 ft x 20 ft warehouse (mixing factor 5). The saturated vapor of chloropicrin (VP =18 mmHg) leaks at a rate of 0.4 cubic feet per minute(cfm) from the drum. The warehouse is ventilated by a 3 ft diameter round duct operated at 4 " water gauge velocity pressure. An industrial hygienist collects an active sample, a passive sample and a direct reading from an instrument. Assume steady-state conditions. Assume NTP. What is the concentration of the room?
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