An activated carbon cylindrical bed is used to control an air stream with a flowrate of 3.6m3/s at 25C at a pressure of 1 atm. The air contains 850ppm of benzene (C6H6). The bed is 0.8m deep, operates at a superficial velocity of 0.5m/s, and is filled with activated carbon with a bulk density of 250kg/m3. Determine the mass of activated carbon present in the bed (in kg) ? a. 1440 b. 1130 C. 1055 d. 1860 e. 2030