Now that the moles of each element are known, the empirical formula may be determined by dividing the moles of each element by the smallest number of moles. This yields a ratio of the number of each element in the empirical formula.
The ratio of C:H:S has been found to be 4:4:1, thus the empirical formula is: C4H4S. The molar mass of the empirical formula is 84 g/mol. Since the molecular weight of the actual compound is 168 g/mol, and is double the molar mass of the empirical formula, the molecular formula must be twice the empirical formula:
C(4 x 2) H(4 x 2) S(1 x 2) which becomes C8H8S2
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