ORGANIC CHEMISTRY Chapter l 1.2B Empirical and Molecular Formulas 91784. Antoine lavoisier first showed that organic compounds were composed primarily of c.h. and o 9 18111831, Liebig, Berzelius, and Dumas quantitative methods for determining the composition of organic compounds 1860, Stanislao Cannizaro, distinguish between empirical(实验式) and molecular formulas(分 子式) Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 1 1.2B Empirical and Molecular Formulas 1784, Antoine Lavoisier first showed that organic compounds were composed primarily of C, H, and O. 1811 ~ 1831, Liebig, Berzelius, and Dumas, quantitative methods for determining the composition of organic compounds. 1860, Stanislao Cannizaro, distinguish between empirical(实验式) and molecular formulas（分 子式）