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 / molar mass of compound) x 100.

Front

What is the molar mass of carbon monoxide (CO)?

Back

The molar mass of CO is approximately 28 g/mol (12 g/mol for C and 16 g/mol for O).

Front

What is the percent composition of carbon in carbon monoxide (CO)?

Back

43%.

Front

What is the percent composition of oxygen in carbon monoxide (CO)?

Back

57%.

Front

What is the molar mass of magnesium sulfate (MgSO4)?

Back

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

Front

What is the percent composition of sulfur in magnesium sulfate (MgSO4)?

Back

27%.

Front

What is the molar mass of magnesium bromide (MgBr2)?

Back

The molar mass of MgBr2 is approximately 200.3 g/mol.

Front

What is the percent composition of magnesium in magnesium bromide (MgBr2)?

Back

13%.

Front

What is the molar mass of sodium hydroxide (NaOH)?

Back

The molar mass of NaOH is 40 g/mol.