A 3000 ft 2 room with a ceiling height of 12 ft is used as a laboratory for testing hazardous chemicals.
If the rate of generation of a hazardous chemical is 0.05 ft 3/min and the ventilation rate is 4000 CFM, what would be the concentration of the hazardous chemical in this room at the end of 200 minutes? (Assume that the safety factor K = 3)
Note that 1 ppm = 1x10-6