stiu ca 1mol, adica 12g C contine N,A= 6,023X10²³ atomi(numarul lui Avogadro)
n(niu)=m/M=600000g /12 g/mol=50000 mol=5x10⁴ mol
1mol....................6,023x10²³at
5x10⁴mol...........x=30,11x10²³ atomi=3,011x10²⁴ atomi