24. Solving a chemistry problem

272. When adsorbed from an aqueous solution of a surfactant, a saturated adsorption layer with a thickness of 6.25 * 10-10 m is formed on a hydrophobic surface. Calculate the molecular weight of the surfactant if its density is 890 kg/m3, and the area occupied by one molecule in the saturated layer is 29 .7*10-20 m2.