EmpiricalFormulaandPercentCompositionPracticeProblems by keralaguest

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									            Empirical Formula and Percent Composition Practice Problems

1. Freons are gaseous compounds used in refrigeration. A particular freon contains 9.93%
Carbon, 56% Chlorine, and 31.4% fluorine. What is the empirical formula?

2. A compound consists of 85% silver and 15% fluorine by mass. What is the empirical formula?

3. A compound consists of 40% calcium, 12% carbon, and 48% oxygen by mass. What is the
empirical formula by mass?

4. Determine the empirical formula of a compound that contains 36.5% sodium, 25.4% sulfur,
and 38.1% oxygen.

5. An organic compound has an empirical formula of CH and a molecular mass of 78 g/mol.
What is the molecular formula?

6. A hydrated compound has an analysis of 18.29% Ca, 32.37% Cl, and 49.34% H2O. What is
the formula?

7. Determine the empirical formula of a compound that contains 58.80% barium, 13.75% sulfur,
and 27.45% oxygen by mass.

8. An organic compound has an empirical formula of CH3 and a molecular mass of 30 g/mol.
What is the molecular formula?

9. A hydrated compound has an analysis of 76.9% CaSO3 and 23.1% H2O. What is the
formula?

Calculate the percent composition for each compound listed.

1) KNO3

2) H2SO4

3) C2H5OH

4) C6H5NH2

								
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