The chemists spread a thin film of certain inert material over the surface of water to cut down the rate of evaporation of water in reservoirs in the water conservation. This technique was pioneered by the Benjamin Franklin three centuries ago. Franklin found that 0.10 mL of oil could spread over the surface of water of about 40m2 in area. Assuming that the oil forms a monolayer, that is, a layer that is only one molecule thick, calculate the length of each oil molecule in nanometers (1nm = 1 * 10-9m).