Percent Composition

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

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100.

Front

What is the percent by mass of Na in NaOH?

Back

57.5%

Front

What is the percent by mass of fluorine in CaF2?

Back

49%

Front

What is the mass % of aluminum in aluminum sulfate Al2(SO4)3?

Back

15.77%

Front

What is the percent composition by mass of sulfur in MgSO4?

Back

27%

Front

What is the molar mass of NaOH?

Back

The molar mass of NaOH is approximately 40 g/mol.

Front

What is the molar mass of CaF2?

Back

The molar mass of CaF2 is approximately 78 g/mol.

Front

What is the molar mass of aluminum sulfate Al2(SO4)3?

Back

The molar mass of aluminum sulfate is approximately 342 g/mol.

Front

What is the molar mass of MgSO4?

Back

The molar mass of MgSO4 is approximately 120 g/mol.