Răspuns:
Explicație:
m,Zn impur= 3,42g
din ecuatia reactiei, deduc masa de Zn pur, si de sare,stiind A,Zn=65g/mol,A,H=1g/mol,M,ZnSO4=161g/mol
1mol......................1mol..........1mol , sau, in grame
Zn + H2SO4----> ZnSO4 + H2
65g........................161g...........2g
x..............................y.............0,1g
x=m,Zn pur= 3,25g
p=m,px100/m,i= 3,25x100/3,42=......................calculeaza!!!!!!
y=m,sare=0,1x161/2g=...........................calculeaza !!!!!