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 each 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 chlorine in NaCl?

Back

61%.

Front

What is the percent composition of Benzene, C6H6?

Back

C = 92.2%, H = 7.8%.

Front

What is the percent by mass of sodium in NaCl?

Back

39%.

Front

What is the percent by mass of oxygen in MgO?

Back

40%.

Front

What is the percent by mass of fluorine in CaF2 (mass of CaF2 is 78 g)?

Back

49%.

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl is approximately 58.44 g/mol.

Front

What is the molar mass of C6H6 (Benzene)?

Back

The molar mass of C6H6 is approximately 78.11 g/mol.

Front

What is the molar mass of MgO?

Back

The molar mass of MgO is approximately 40.30 g/mol.