Percent Composition Problems
Do not write on this sheet. Complete all work on a separate sheet of paper.
1. Calculate the percent composition of the following:
a. NH3
b. C6H6
c. N2H4
d. P2O5
2. Calculate the percent composition of copper (I) sulfide.
3. Calculate the percent composition of sucrose, C12H22O11, and glucose, C6H12O6.
4. Determine the percent of water by mass in sodium carbonate decahydrate, Na2CO3 • 10H20.
5. A sample of an unknown compound with a mass of 0.2370 g is extracted from the roots of a plant.
Decomposition of the sample produces 0.09482 g of carbon, 0.1264 g of oxygen, and 0.0158 g of
hydrogen. What is the percent composition of the compound?
6. Find the percent composition of a compound that contains 2.3 g of sodium, 1.6 g of oxygen, and 0.1 g of
hydrogen in a sample of 4 g of the compound.
7. A sample of an unknown compound with a mass of 0.562 g has the following percent composition. 13%
carbon, 2.2% hydrogen, and 84.8% fluorine. When this compound is decomposed into its elements,
what mass of each element would be recovered?
Percent Composition Problems
Do not write on this sheet. Complete all work on a separate sheet of paper.
1. Calculate the percent composition of the following:
a. NH3
b. C6H6
c. N2H4
d. P2O5
2. Calculate the percent composition of copper (I) sulfide.
3. Calculate the percent composition of sucrose, C12H22O11, and glucose, C6H12O6.
4. Determine the percent of water by mass in sodium carbonate decahydrate, Na2CO3 • 10H20.
5. A sample of an unknown compound with a mass of 0.2370 g is extracted from the roots of a plant.
Decomposition of the sample produces 0.09482 g of carbon, 0.1264 g of oxygen, and 0.0158 g of
hydrogen. What is the percent composition of the compound?
6. Find the percent composition of a compound that contains 2.3 g of sodium, 1.6 g of oxygen, and 0.1 g of
hydrogen in a sample of 4 g of the compound.
7. A sample of an unknown compound with a mass of 0.562 g has the following percent composition. 13%
carbon, 2.2% hydrogen, and 84.8% fluorine. When this compound is decomposed into its elements,
what mass of each element would be recovered?
Percent Composition Problems
Do not write on this sheet. Complete all work on a separate sheet of paper.
1. Calculate the percent composition of the following:
a. NH3
b. C6H6
c. N2H4
d. P2O5
2. Calculate the percent composition of copper (I) sulfide.
3. Calculate the percent composition of sucrose, C12H22O11, and glucose, C6H12O6.
4. Determine the percent of water by mass in sodium carbonate decahydrate, Na2CO3 • 10H20.
5. A sample of an unknown compound with a mass of 0.2370 g is extracted from the roots of a plant.
Decomposition of the sample produces 0.09482 g of carbon, 0.1264 g of oxygen, and 0.0158 g of
hydrogen. What is the percent composition of the compound?
6. Find the percent composition of a compound that contains 2.3 g of sodium, 1.6 g of oxygen, and 0.1 g of
hydrogen in a sample of 4 g of the compound.
7. A sample of an unknown compound with a mass of 0.562 g has the following percent composition. 13%
carbon, 2.2% hydrogen, and 84.8% fluorine. When this compound is decomposed into its elements,
what mass of each element would be recovered?