The Mole

Front

What is Avogadro's number?

Back

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

Front

How is moles abbreviated?

Back

mol

Front

How many moles are in 6.02 x 10^23 molecules of H2O?

Back

1 mole, as 6.02 x 10^23 is defined as one mole.

Front

How many molecules are there in 31.8 moles of water?

Back

1.91 x 10^25 molecules, calculated using Avogadro's number.

Front

How many molecules are in 2.5 mol of NaCl?

Back

1.51 x 10^24 molecules, calculated using Avogadro's number.

Front

What is the definition of a mole?

Back

A mole is a unit of measurement for amount of substance in the International System of Units (SI), defined as containing exactly 6.02 x 10^23 particles.

Front

What is the relationship between moles and mass?

Back

The mass of a substance in grams is equal to the number of moles multiplied by the molar mass (g/mol).

Front

How do you convert grams to moles?

Back

Divide the mass of the substance (in grams) by its molar mass (g/mol).

Front

What is molar mass?

Back

The mass of one mole of a substance, usually expressed in grams per mole (g/mol).

Front

How do you find the number of molecules from moles?

Back

Multiply the number of moles by Avogadro's number (6.02 x 10^23).