Practice Percent Composition in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
Percent composition is the percentage by mass of each element in a chemical compound.
What fraction of the compound's total weight is made up by each element inside it.
Example 1
easyCalculate the percent composition by mass of each element in \text{H}_2\text{O}.
Example 2
mediumCalculate the percent by mass of nitrogen in ammonium nitrate (\text{NH}_4\text{NO}_3).
Example 3
easyWhat is the percent composition of carbon in \text{CO}_2? (C = 12.01, O = 16.00)
Example 4
easyWhat percent by mass of calcium carbonate (\text{CaCO}_3) is oxygen? (Ca = 40.08, C = 12.01, O = 16.00)