# Worksheet – Empirical formulas

Worksheet – Empirical formulas and Molecular formulas Periods

Can you help me out with these 3 problems

5. Qualitative analysis shows that a compound contains 32.38%sodium, 22.65% sulfur and 44.99 % oxygen. Find the empirical formula of this compound.

6. Analysis of a 20.0 gram sample of a compound containing only calcium and bromine indicates that 4.00 grams of calcium are present. What is the empirical formula of the compound formed?

7. A 60.00 gram sample of tetraethyl lead, a gasoline additive, is found to contain 38.43grams of lead, 17.83 grams of carbon, and 3.74 grams of hydrogen. Find its empirical formula.

# Worksheet – Empirical formulas

Worksheet – Empirical formulas and Molecular formulas Periods

4. A compound is found to contain 63.52% iron and 36.48% sulfur. Find its empirical formula.

5. Qualitative analysis shows that a compound contains 32.38%sodium, 22.65% sulfur and 44.99 % oxygen. Find the empirical formula of this compound.

6. Analysis of a 20.0 gram sample of a compound containing only calcium and bromine indicates that 4.00 grams of calcium are present. What is the empirical formula of the compound formed?

7. A 60.00 gram sample of tetraethyl lead, a gasoline additive, is found to contain 38.43grams of lead, 17.83 grams of carbon, and 3.74 grams of hydrogen. Find its empirical formula.

8. Determine the molecular formula for the compound with empirical formula P2O5 and molar mass of 284 g/mol.

9. Determine the molecular formula for the compound with empirical formula OCNCl and molar mass of 232.41 g/mol.

10. A compound is found to be 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. Its molar mass is 60.0 g/mol. What is its molecular formula?

11. A compound is 64.9%carbon, 13.5% hydrogen and 21.6% oxygen. Its molar mass is 74.0 g/mol. What is its molecular formula?

12. A compound is 54.5% carbon, 9.1% hydrogen and 36.4% oxygen. Its molar mass is 88.0 g/mol. What is its molecular formula?

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