The two-bed carbon adsorption system will handle 3.78 m3 s-1 (8000 acfm) of air containing 700 ppm of hexane. Pilot plant studies indicate that the carbon can absorb 8 lbm hexane per 100 lbm carbon under the conditions at which the plant will be operating. The operating conditions will be 32.2 C (90 F), 760 mm Hg (1 atm) and a removal efficiency of 99%. Hexane (C6H14) has a molecular weight of 86.18 g/g-mole. The airflow rate is 3.78 m3 s-1 (8000 acfm), air temperature is 32.2 C (90 F) and pressure is 760 mm Hg (1 atm). Find the mass (kg) of carbon needed.