A sample from a contaminated aquifer reveals a concentration of 120 mg l^-1 of a particular organic compound in the groundwater. The aquifer has a porosity n = 0.3, and a dry bulk density of = 2.3 kg l^-1. The distribution coefficient is K_d = 0.1 l kg^-1 a) Estimate the sorbed concentration c_s in the aquifer. b) Estimate the mass of sorbed contaminant in one cubic meter of aquifer. c) Estimate the mass of dissolved contaminant in one cubic meter of aquifer.