Zn + 2HCl --> ZnCl2 + H2↑
1) 10% impuritati ==> 90% pur
p=mpur/mipur*100==>mpur=p*mipur/100=90*260/100=234g Zn pur
65g Zn......73g HCl.......136g ZnCl2.....2gH2
234g..........x=262.8g.....y=489.6g
Cp=md/ms*100==>ms=md*100/Cp=262.8*100/10=2628g sol.HCl
2) msare=489.6
n=m/M=489.6/136=3.6 moli sare
MZn=65g/mol
MHCl=36.5g/mol
MZnCl2=136g/mol