A polluted air stream flowing at 12,000 acfm at 90 F and 1 atm has a concentration of 500 ppm of ethylbenzene (C8H10). Pilot plant studies of the adsorption process indicate that 11 lb. (net) of ethylbenzene will be adsorbed per 100 lb. of carbon during normal everyday operations. Calculate the minimum amount of carbon needed in one bed for a twohour run. Give your answer in pounds. Carbon has a bulk density of 25 lb/ft. Bed dimensions: 7.75 ft x 15.5 ft x 1.5 ft.