Sơ đồ 1:(1)s+o2--to->so2
(2)2SO2+O2---to(xt v2o5)2So3
(3)so3+h2o--->h2so4
(4)h2so4+ba--->baso4+h2
Sơ đồ 2:(1)4Na+o2---to->2Na2o
(2)Na2o+h2o--->2Naoh
(3)2NaOH+H2so4--->na2so4+2h2o
(4)Na2SO4+BaCl2---->Baso4+2nacl
Sơ đồ 3:(1)Cao+co2--to-->Caco3
(2)CaCo3---to-->cao+co2
(3)Cao+h2o--->ca(oh)2
(4)ca(oh)2 +co2--->caco3+h2o
(5)caco3+h2so4--->caso4+co2+h2o
(Muốn hỏi thêm thì inb mình nhé:))))^_^)