Question: what is the empirical formula for c10h20o5?
Answer: To go from molecular formula to empirical formula you basically divide by the greatest common factor of all the elements. Remember that empirical formulas are ratios of the molecular. For example, C10H20O5 the greatest common factor of 10,20,and 5 is 5. So you divide all those coefficients by 5 and get c2h4o!