Molecular Formulas. Find empirical formula Calculate molar mass of empirical formula Molar mass of compound / molar mass of empirical formula (we’ll call this the factor) Multiply subscripts by factor to get molecular formula. Molecular Formula.
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C2H3O2 = 2x12 + 3x1 + 2x16= 59 g/mol
118.1 / 59 = 2
1. Analysis of a chemical used in photographic developing fluid indicates a chemical composition of 65.45% C, 5.45% H, and 29.09% O. The molar mass is found to be 110 g/mol. Determine the molecular formula.
2. A compound was found to contain 49.98 g carbon and 10.47 g hydrogen. The molar mass of the compound is 58.12 g/mol. Determine the molecular formula.
3. A colorless liquid composed of 46.68% nitrogen and 53.32% oxygen has a molar mass of 60.01 g/mol. What is the molecular formula?