What is the correct definition of a mole?

A mole is defined as the amount of a substance that contains exactly 6.02214076 X10²³ elementary entities of the given substance. Thus, a mole of a substance is referred to as the mass of a substance containing the same number of fundamental units as atoms in exactly 12.000 g of 12C.

• The following formula can represent the number of moles of a substance in a given pure sample:

  n = N/N_A

• n is the number of moles of the substance
• N_A is the Avogadro constant.