each month the splendid dry cleaning company buys one barrel ( 42 gal., 0.160 m^3) of tetrachloroethylene (C2Cl4) (M.W.= 166, p= 1.594 g/cm^3) ninety percent of the fluid is lost to the atmosphere and 10% remains as residue to be disposed of. draw the mass balance diagram and calculate the monthly mass emission rate to the atmosphere in kilograms per month. how much will it cost to haul the residue away every 6 months if the cost is $15 per kilogram?