2. You are designing a packed tower to treat a contaminated water stream by air stripping. The design flow rate is 500 gallons per minute (gpm). The contaminated stream contains 1,2-dichloropropane (1,2-DCP), 1,1,1-trichloroethane (TCA), and 1,1-dichloroethylene (DCE). The concentrations of the three contaminants, and some other properties of those chemicals, are given in the table below. Assume a design temperature of 10 C. Chemical Influent conc. (mg/L) 1,2-DCP 5.0 1,1,1-TCA | 0.6 1,1-DCE 0.4 Required Diffusion Diffusion conc. co. in water co. in air (mg/L) (m/s) (m/s) 0.1 0.87x10-9 0.78x10-5 0.2 0.88x10-9 0.78x10-5 0.01 1.04x10-9 0.90x10-5 H at 25C AHVOL (dimensionless) (kJ/mol) 0.114 34.0 0.705 31.0 1.07 24.5 a. Find the air flow rate that will give a stripping factor of at least 3 for all the compounds at the design temperature. Report your air flow rate in units of m3/s