Se aplica relatia n(niu) = m,g/M,g/mol sau n= m,kg/M,k/mol
d. n(niu)= 180g/ 27g/mol Al= calculeaza !!!
c. n= 48kg/24kg/kmol= 2kmol=2000mol Mg
d. n= 48g/19g/mol= 2,526 mol F
n=N/N,A---> N= 2,526molx 6,023x10²³ at/mol= calculeaza !!!!!
N,A este numarul lui Avogadro