FeS + 2HCl -----> FeCl2 + H2Sn(FeS)=8.8/(56+32)=0.1moln(HCl)=0.2*2=0.4molV(H2S)=22.4*(0.1 - 0.2*0.1)=1.792Lc(Fe2+)=0.1/0.2=0.5mol/Lc(H+)=2.0-1.0=1.0mol/L