Percent Composition

Front

What is percent composition?

Back

The percent by mass of an element in a compound.

Front

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

Back

(Mass of the element in 1 mole of the compound / Molar mass of the compound) x 100%.

Front

What is the percent composition of oxygen in carbon dioxide (CO2)?

Back

72.7 %.

Front

What is the percent composition of copper in CuBr2?

Back

28.5 %.

Front

Which element contributes more to the total atomic mass of Lithium phosphide (Li3P)?

Back

Phosphorus.

Front

What is the molar mass of Lithium (Li)?

Back

6.94 g/mol.

Front

What is the molar mass of Phosphorus (P)?

Back

30.97 g/mol.

Front

If a compound has a molar mass of 100 g/mol and contains 20 g of element X, what is the percent composition of element X?

Back

20%.

Front

What is the formula for calculating percent composition?

Back

Percent Composition = (Mass of element / Total mass of compound) x 100%.

Front

In a compound with a percent composition of 40% for element A, what does this indicate?

Back

Element A makes up 40% of the total mass of the compound.