a 7,3
Fe-Cu +2HCl=FeCl2 +H2 +Cu Cu nu rectioneaza cu HCl
56 2.36,5
md =c.ms:100 intr-o r.chimica dintr-o sol. react.
numai md
md=20.36,5:100=7,3gHCl
a=56.7,3:2.36,5=5,6gFe
20-5,6=14,4gCu
20gamestec--------5,6gFe---------14,4gCu
100------------------x----------------------y
x=100.5,6:20=28 la suta Fe
y=100.14,4:20=72 la suta Cu