Hoàn thành sơ đồ phản ứng sau : FeS-> H2S -> HCL -> NaCl -> Cl2 -> FeCl3

$FeS+2HCl\to FeCl_2+H_2S$

$CuCl_2+H_2S\to CuS+2HCl$

$NaOH+HCl\to NaCl+H_2O$

$2NaCl\buildrel{{đpnc}}\over\to 2Na+ Cl_2$

$2FeCl_2+Cl_2\to 2FeCl_3$