Mole Conversion Practice Problems (Elements)

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (in g/mol).

Front

What is the molar mass of carbon (C)?

Back

The molar mass of carbon is 12.01 g/mol.

Front

How many grams are in 0.63 moles of carbon?

Back

7.57 g C (calculated as 0.63 moles x 12.01 g/mol).

Front

What is the molar mass of silver (Ag)?

Back

The molar mass of silver is 107.87 g/mol.

Front

How do you calculate the number of moles from atoms?

Back

To calculate moles from atoms, divide the number of atoms by Avogadro's number (6.022 x 10^23).

Front

How many moles are in 3.01 x 10^22 atoms of magnesium (Mg)?

Back

0.05 moles Mg (calculated as 3.01 x 10^22 atoms ÷ 6.022 x 10^23 atoms/mole).

Front

What is the molar mass of arsenic (As)?

Back

The molar mass of arsenic is 74.92 g/mol.

Front

How do you convert atoms to grams?

Back

To convert atoms to grams, first convert atoms to moles, then multiply by the molar mass.

Front

How many grams are in 8.65 x 10^25 atoms of arsenic?

Back

10,765 g As (calculated as 8.65 x 10^25 atoms ÷ 6.022 x 10^23 atoms/mole x 74.92 g/mol).