Mole Concept:

The amount of matter that contains as many atoms, ions, or molecules as the number of atoms in exactly 12g of C-12 is called mole.

Mole can also be defined as atomic mass, molecular mass or formula mass expressed in grams Number of moles of a substance.

$\text{Number of moles of a substance} = \frac{\text{Mass in grams}}{\text{Molecular mass}}$

A mole is an amount of a substance that contains 6.02 x 10²³ particles of that substance. This experimentally determined number is known as Avogadro’s number.

Definition of mole:

The definition of mole, accepted internationally, is as follows:

More is the amount of a substance which contains the same number of chemical units as there are atoms in exactly 12 grams of pure Carbon-12.

Symbol of the mole unit:

The unit of mole is given a symbol ‘mol’.

Example:

For example, a mole of carbon is 6.02 x 10²³ atoms.

A mole of Sulphur is 6.02 x 10²³ atoms.

A mole of water is 6.02 x 10²³ molecules.