(a) The characteristic odor of pineapple is due to ethyl butyrate, a compound containing carbon, hydrogen, and oxygen. Combustion of 7.23 mg of ethyl butyrate produces 16.43 mg of CO2 and 6.71 mg of H2O. What is the empirical formula of the compound? (Type your answer using the format CO2 for CO2.)
(b) Nicotine, a component of tobacco, is composed of C, H, and N. A 4.725 mg sample of nicotine was combusted, producing 12.818 mg of CO2 and 3.675 mg of H2O. What is the empirical formula for nicotine?
If the substance has a molecular mass of 160 +/- 5 g/mol, what is its molecular formula?