Empirical and Molecular Formulas CHEM 1A Empirical Formula: The lowest whole number ratio between the elements in a compound (not necessarily the actual formula of
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Empirical and Molecular Formula Practice Find the empirical formula for the following molecular compositions: 1. 88.8% copper; 11.2% oxygen 2. 40% carbon; 6.7% hydrogen; 53.3% oxygen 3. 92.3% carbon; 7.7% hydrogen 4. 70.0% iron; 30.0% oxygen 5. 5.88% hydrogen; 94.12% oxygen 6. 38.7% chlorine; 61.3% fluorine 7. 7.19% phosphorus; 92.81% bromine 8. 30.4% nitrogen; 69.6% oxygen Find the molecular formula for the following: 1. If the compound in question 7 has a molar mass of 431g/mol, what is the molecular formula? 2. If the compound in question 8 has a molar mass of 92g/mol, what is the molecular formula? 3. Naphthalene is a carbon and hydrogen containing compound often used in moth balls. The empirical formula is C5H4 and its molar mass is 128.16g/mol. Find the molecular formula. 4. A compound with the following composition has a molar mass of 60.10g/mol: 39.97% carbon; 13.41% hydrogen; 46.62% nitrogen. Find the molecular formula.
