2. a) The napthalene concentration in a contaminated groundwater is 6 mg L-1. Adsorption experiments found that sorption of napthalene onto aquifer clays followed a linear relationship, with Kd = 11 L kg-1. Calculate the concentration of napthalene adsorbed onto the clay minerals in the aquifer.

b) If the groundwater comes into contact with air, what would be the concentration of naphthalene (C10H8) in the gas phase in mol/L?