On a visit to England, Benjamin Franklin carried out an experiment in which he poured a teaspoon (about 10mL) of oil onto the surface of the pond at Clapham Common, and observed that it spread over an area of about half an acre (1 acre=4047 square meters). Assuming the oil layer to be one molecule thick, calculate the approximate diameter in Angstroms (1 A = 10^-10 m) of a single molecule. (Use volume = area x depth.)