Avogardo's number is a constant, named after the scientist Amedeo Avogadro that represents the number of molecules or atoms that are contained in the amount of substance given by one mole. Na= 6.022×1023
Mole on the other hand is a chemical mass unit,defined to be 6.022 x 1023 molecules, atoms, or some other unit. This is the reason why the mole and Avogadro’s number are now almost synonymous with each other.