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 molar mass of carbon monoxide (CO)?

Back

The molar mass of CO is 28 g/mol (12 g/mol for C + 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 calcium fluoride (CaF2)?

Back

The molar mass of CaF2 is 78 g/mol (40 g/mol for Ca + 2 x 19 g/mol for F).

Front

What is the percent composition of fluorine in calcium fluoride (CaF2)?

Back

49%.

Front

What is the molar mass of calcium nitrate (Ca(NO3)2)?

Back

The molar mass of Ca(NO3)2 is 164 g/mol (40 g/mol for Ca + 2 x (14 g/mol for N + 3 x 16 g/mol for O)).

Front

What is the percent composition of nitrogen in calcium nitrate (Ca(NO3)2)?

Back

17%.

Front

What is the molar mass of carbon dioxide (CO2)?

Back

The molar mass of CO2 is 44 g/mol (12 g/mol for C + 2 x 16 g/mol for O).