When 1x10-4 cm3 of a drug dissolved in benzene was spread on the surface of water, the monomolecular layer of the drug formed when the benzene had evaporated covered an area of 250 cm2. Calculate the length in angstroms of the drug molecule and the cross-sectional area per molecule in square angstroms. The drug has a molecular weight of 453 and a density of 0.70 g/cm3.