Mole Calculations

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How many grams are in one mole of water (H2O)?

Back

One mole of water (H2O) has a mass of approximately 18.02 grams.

Front

What is the molar mass of sodium chloride (NaCl)?

Back

The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol.

Front

How many moles are in 22 grams of NaCl?

Back

Number of moles = 22 g / 58.44 g/mol ≈ 0.38 moles.

Front

What is the relationship between moles and particles?

Back

1 mole of any substance contains Avogadro's number (6.02 x 10^23) of particles.

Front

How do you convert moles to grams?

Back

Grams = number of moles x molar mass (g/mol).

Front

What is the mass of 2 moles of calcium hydroxide (Ca(OH)2)?

Back

Mass = 2 moles x 74.1 g/mol = 148.2 grams.