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

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 10^23).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the atomic masses of all the atoms in the molecular formula, expressed in grams per mole (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

What is the relationship between volume and moles of a gas at STP?

Back

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

Front

How do you convert grams to moles?

Back

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

Front

What is the molar mass of argon (Ar)?

Back

The molar mass of argon (Ar) is approximately 39.95 g/mol.

Front

How many moles are in 46 grams of sodium?

Back

To find the number of moles in 46 grams of sodium, divide 46 g by the molar mass of sodium (22.99 g/mol), which equals approximately 2.00 moles.

Front

What is the formula to calculate the number of particles from moles?

Back

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