Zumdahl Chapter 3: The mole

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