Mole Conversion Practice

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 10²³ particles (atoms, molecules, ions, etc.).

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, divide the number of atoms by Avogadro's number (6.022 x 10²³).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10²³, which is the number of particles in one mole of a substance.

Front

How do you calculate the number of molecules in a given number of moles?

Back

Multiply the number of moles by Avogadro's number (6.022 x 10²³).

Front

What is the formula to find the mass of a substance in grams from moles?

Back

Mass (g) = Moles x Molar Mass (g/mol).

Front

What is the molar mass of sodium (Na)?

Back

The molar mass of sodium (Na) is approximately 22.99 g/mol.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass in grams by the molar mass of the substance.

Front

What is the molar mass of sodium sulfate (Na₂SO₄)?

Back

The molar mass of sodium sulfate (Na₂SO₄) is 142.1 g/mol.

Front

How many moles are in 25 molecules of NaCl?

Back

To find moles, divide the number of molecules by Avogadro's number: 25 / (6.022 x 10²³) = 4.15 x 10⁻²² moles.

Front

What is the relationship between moles and volume at STP?

Back

At standard temperature and pressure (STP), 1 mole of an ideal gas occupies 22.4 liters.