Question

S-SO2-SO3-H2SO4-(NH4)2SO4-H2SO4-BaSO4

Answer 1

Цепочка 1
1) S+O2=SO2
2SO2+O2=2SO3
SO3+H2O=H2SO4
H2SO4+2NaOH=Na2SO4+2H2O
Na2SO4+BaCl2=BaSO4+2NaCl

Answer 2

S+O2-->SO2
2SO2+O2-->2SO3
SO3+H2O-->H2SO4
H2SO4+2NH3-->(NH4)2SO4
(NH4)2SO4-->2NH3+H2SO4
H2SO4+BaCL2-->2HCL+BaSO4