Question

Din ce cantitate de acid clorhidric 37% se poate extrage clorul necesar obtinerii a 40g FeCl2 5%.Scrie ecuatiile reactiilor chimice?

Answer 1

Fe+2HCl=FeCl₂+H₂

40*5/100=2g FeCl₂ pur

Masa molara FeCl₂=56+2*35.5=127g/mol
Masa molara HCl=35.5+1=36.5g/mol
x=masa de HCl consumat
x=2*2*36.5/127
x=1.14g HCl

c=md*100/ms
⇒ms=md*100/c
ms=1.14*100/37
ms=3.08g