What is the mass of 1 mol of sodium atoms?
The answer to this question is found in the definition of a mol, a mol and is defined as the number of 12C atoms in 12 g of 12C. This number has been experimentally determined as 6.022 x 1023 atoms. A mol of any substance is defined as the amount of the substance which contains the same number of units as are in 12 g of 12C or 6.023 x 1023 units of the substance. Remember a unit is an atom, a molecule or a formula unit.