Fe + S ----> FeS
a.......a...........a...
FeS + 2HCl ----> FeCl2 + H2S
.a.........................................a..
Fe + 2HCl -----> FeCl2 + H2
..b......................................b....
n_{khí}=0,15 mol
ta có:
\left\{\begin{matrix} a+b=0,15 & & \\ \frac{34a+2b}{2(a+b)}=\frac{19}{3}& &...