Lord Rayleigh was able to estimate the size of an oil molecule by allowing a small drop of oil (of mass 8.0 x 10^-4 g and density0.90 g/cm^3) to spread out over the surface of a water pond. He observed that the maximum area covered was 0.55 m^2. Assuming that this maximum area corresponds to a mono-layer of oil (i.e. a layer one molecule thick), estimation the size of the oil molecule from Lord Rayleigh's experiment.