Carbon residue is also an important property of a biodies, viscous residue and pitch.Biodiesel is a mixture of hundreds of different hydrocarbons. The specific mixture depends on the feed stocks (vegetable oil, animal fat, waste oil…) used and the processing methods..The biodiesel chemical formula is a combination of alkyl C12-C22 Fatty Acid Methyl Esters. Its Molecular weight is ~292(q). As to biodiesel chemical composition, carbon, hydrogen and oxygen weigh 77 grams, 12 grams and 11 grams. ... Thechemical formula for Methyl Linolaeate is C19H34O2 and for Ethyl Stearate is C20H40O2.Biodiesel composition is made up of long fatty acids than contain carboxyl, a functional COOH group. These acids constitute sole chains of 12 up to 24 carbons per group of COOH
Please look at this reference: https://www.biofuelscoproducts.umn.edu/sites/biodieselfeeds.cfans.umn.edu/files/2009-hansen-a_chemical_analysis_of_samples_of_crude_glycerol.pdf