Polychlorinated biphenyls (PCBs) are a mixture of over 200 individual compounds. These pollutants have been spread widely throughout the environment. If the concentration of Aroclor-1260 (one of the individual compounds) was 300 pmol/m³ in the air above a lake, what would be the dissolved concentration in the lake at equilibrium (units of mass per volume)? The Henrys law constant for this compound is 10 mol/L-atm. Assume the temperature is 25C.