Срочно!
Решите цепочку:
S -> FeS -> H2S -> Na2S -> Na2SO3

1. Fe+S=FeS

2. FeS+2HNO3=H2S+Fe(NO3)2

3. H2S+Na2CO3=Na2S+CO2+H2O

4. Na2S+ZnSO3=ZnS+Na2SO3

1.S+FE=FES

2.FES+2HCL=H2S+FECL2

3.H2S+NA2O=NA2S+H2O

4.NA2S+H2SO3=NA2SO3+H2S