Percent Composition Practice Problems

Front

What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100.

Front

How do you calculate the percent composition of an element in a compound?

Back

To calculate percent composition, use the formula: (mass of element in 1 mole of compound / molar mass of compound) x 100.

Front

What is the molar mass of Zn₃(PO₄)₂?

Back

The molar mass of Zn₃(PO₄)₂ is approximately 386.11 g/mol.

Front

What is the percent composition of zinc in Zn₃(PO₄)₂?

Back

The percent composition of zinc in Zn₃(PO₄)₂ is 50.80%.

Front

What is the total atomic mass of lithium phosphide (Li₃P)?

Back

The total atomic mass of lithium phosphide (Li₃P) is approximately 34.83 g/mol.

Front

What is the percent composition of lithium in Li₃P?

Back

The percent composition of lithium in Li₃P is 40%.

Front

What is the molar mass of KMnO₄?

Back

The molar mass of KMnO₄ is approximately 158.04 g/mol.

Front

What is the percent by mass of manganese in KMnO₄?

Back

The percent by mass of manganese in KMnO₄ is 35%.

Front

How many hydrogen atoms are in (NH₄)₃PO₄?

Back

There are 12 hydrogen atoms in (NH₄)₃PO₄.

Front

What is the molar mass of aluminum phosphate (AlPO₄)?

Back

The molar mass of aluminum phosphate (AlPO₄) is approximately 121.94 g/mol.