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Empirical Formula Practice Test Questions

Chemistry Test Questions

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The empirical formula of a compound represents the simplest whole number ratio between the elements that make up the compound. This ten question practice test deals with finding empirical formulas of chemical compounds.

You may wish to review this topic before taking this test by reading the following:

How to Find the Molecular Formula and Empirical Formula
How to Calculate the Empirical and Molecular Formula of a Compound

A periodic table will be required to complete this test. Answers appear after the final question.

Question 1

Sulfur Oxide
Ben Mills
What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass?

Question 2

A compound is found to contain 23.3% magnesium, 30.7% sulfur and 46.0% oxygen. What is the empirical formula of this compound?

Question 3

What is the empirical formula for a compound containing 38.8% carbon, 16.2% hydrogen and 45.1% nitrogen?

Question 4

A sample of an oxide of nitrogen is found to contain 30.4% nitrogen. What is its empirical formula?

Question 5

A sample of an oxide of arsenic is found to contain 75.74% arsenic. What is its empirical formula?

Question 6

What is the empirical formula for a compound containing 26.57% potassium, 35.36% chromium, and 38.07% oxygen?

Question 7

What is the empirical formula of a compound comprised of 1.8% hydrogen, 56.1% sulfur and 42.1% oxygen?

Question 8

A borane is a compound containing only boron and hydrogen. If a borane is found to contain 88.45% boron, what is its empirical formula?

Question 9

Find the empirical formula for a compound containing 40.6% carbon, 5.1% hydrogen, and 54.2% oxygen.

Question 10

What is the empirical formula of a compound containing 47.37% carbon, 10.59% hydrogen and 42.04% oxygen?

Answers

1. SO3
2. MgSO3
3. CH5N
4. NO2
5. As2O3
6. K2Cr2O7
7. H2S2O3
8. B5H7
9. C2H3O2
10. C3H8O2

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