Mole (mol) the number equal to the
number of atoms in exactly 12 g of 12C.

This number called Avogadro's
number: 6.02214 x 1023
(6.022 x 1023).

The term mole is number of items
(e.g.: atoms, molecules, .... ) For example: Dozen of eggs means

12 eggs and
mole of eggs means 6.022 x 1023
eggs

Mass
of 1 mol 12C
= 12 g

The mass of 1 mol of atomic mass
unit is 1 g

The mass of 1 mol of an element is
equal to its atomic mass in gram