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Cate grame de solutie de acid clorhidric de concentratie 10% va reactiona cu 12,7 g zinc?
Trebuie sa dea 142,6 g solutie


Răspuns :

x        12,7
2HCl+Zn->ZnCl2+H2
73       65
x=14,26 g HCl
10/100=14,26/m s
m s=142.6g HCl

65g...2*36,5g
Zn + 2HCl -> ZnCl2 + H2
12,7g..x=?
x=12,7*73/65=14,26 g HCl
c/100=md/ms => ms=md×100/c=14,26*100/10=142,6g solutie HCl