The empirical formula is a chemical formula that provides the smallest, whole number ratio of elements in a compound. Using the mass of each element or the mass percentage of each element in a compound, the empirical can be determined. The molecular formula is a whole number multiple of the empirical formula. The multiple is determined from the ratio of the molar mass to the empirical formula mass. What is the molecular formula if the molar mass is 168.0 g/mole and the empirical formula is C4H4S?