Percent Composition and Chemical Formula

Calculate the percent composition of carbon in carbon dioxide (CO2).

• 75%

• 27.3%

• 10%

• 50%

Determine the chemical formula for a compound that consists of 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen.

• The chemical formula is C3H7O4

• C4H6O3

• C2H5O3

• C3H8O3

Find the empirical formula for a compound that contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen.

• CH3O2

• C2H3O2

• C4H5O4

• The empirical formula is C3H4O3.

Determine the molecular formula for a compound with an empirical formula of CH2O and a molar mass of 180 g/mol.

• C6H12O6

• C3H6O3

• CH4O2

• C4H8O4

Calculate the percent composition of hydrogen in water (H2O).

• 50%

• 25%

• 33.33%

• 11.11%

Determine the chemical formula for a compound that consists of 18.2% carbon, 72.7% oxygen, and 9.1% hydrogen.

• C3H6O2

• CH3O2

• C2H4O3

• C1H2O4

Find the empirical formula for a compound that contains 30.4% phosphorus and 69.6% oxygen.

• PO4

• P4O6

• P2O3

• P3O2

Determine the molecular formula for a compound with an empirical formula of C2H5 and a molar mass of 58 g/mol.

• C3H8

• C5H12

• C6H14

• C4H10

Calculate the percent composition of nitrogen in ammonia (NH3).

• The percent composition of nitrogen in ammonia is 50%

• The percent composition of nitrogen in ammonia is 100%

• The percent composition of nitrogen in ammonia is 25%

• The percent composition of nitrogen in ammonia is 82.3%

Determine the chemical formula for a compound that consists of 46.7% nitrogen and 53.3% oxygen.

• NO4

• N2O3

• NO2

• N3O2