Find the molecular formula of benzocaine the following data were obtained from experiments to a local anesthetic, which contains only the hydrogen, carbon, oxygen and nitrogen. Complete combustion of 3.54-g sample of benzocaine with excess the O2 produced 8.49 g of CO2 and 2.14 g H2O. The molar mass of benzocaine was found to be 165. Another sample of mass 2.35 g was found to contain 0.199 g N. Explain the molecular formula of benzocaine.