Leachate is produced when precipitation infiltrates a sanitary landfill, contacts the waste material, and appears at the bottom of the stored waste. Assume 6 kg of benzene (molecular formula of C₆H₆) were placed in the landfill and it is all dissolved in the 100,000 gallons of leachate produced during one year. What is the benzene concentration in the leachate during this one year in (a) mg/L; (b) ppbm; and (c) moles/L?