Răspuns:
p=m,px100/m,i-->m,p= 275x80/100g= 220g FeS pur
M,FeS= 88g/mol----> niu= m/M= 220/88 mol= 2,75molFeS
FeS + 2HCl---->FeCl2 + H2S ↑
1mol........2mol......................1mol
2,75mol........x........................y
x= niu= 5,5milHCl
y=niu= 2,75molH2S
M,HCl= 36,5g/mol----> m= niuxM= 5,5X36,5g= md
c= mdx100/ms---->ms= 5,5x36,5x100/36,5g= 550g
V,=niuxVm= 2,75x22,4 l= 61,6 l H2S
Explicație: