Срочно цепочка! S--ZnS--H2S---SO2---H2SO4----Na2SO4----NaCl
1)S+Zn=ZnS 2) ZnS+2HCl=H2S+ZnCl2 3) 2H2S+3O2=2SO2+2H2O 4) SO2+ H2O=H2SO4 5) H2SO4+2NaOH=Na2SO4+2H2O 6) Na2SO4+2HCl=2NaCl+H2SO4