-calculez moli de acid din solutie
c,m= n /V---> n= 1,5x0,3mol= 0,45molHCl
-calculez moli de Zn, din ecuatia
1mol......2mol
Zn + 2HCl ----> ZnCl2 + H2
x.........0,45mol
x==0,225molZn
m,Zn= nxM=0,225molx65g/mol= 14,625gZn pur
-calculez puritatea
p= m,px100/m,i=14,625.x100/15=......................calculeaza !!!!
