The solubility of naphthacene in water at 25°C was reported to be 6.6 × 109 mol(1) L1 sln. Assuming that 1.00 L sln = 1.00 kg sln, the corresponding mass percent and mole fraction calculated by the compiler are 1.5 × 107 g(1)/100 g sln and 1.2 × 1010.