³²₁₆S 1atom are 16electroni, 16protoni si (32-16) neutroni
n(niu)= m/M=160g/32g/mol=5mol
1mol contine N,A atomi...16N,Aelectroni...16N,Aprotoni......16N,Aneutroni
5mol...............5N,A,... " 80N,A " 80N,A ' " 80N,A
unde N,A= 6,O23X10²³ particula/mol
INLOCUIESTE -L pe N,A si calculeaza !!!!