Ответы на вопрос:
1) 4fe + 3o2 = 2fe2o3
fe2o3 + 3h2so4 = fe2(so4)3 + 3h2o
fe2(so4)3 + 6naoh = 2fe(oh)3 + 3na2so4
fe(oh)3 + 3hcl = fecl3 + 3h2o
2) s + o2 = so2
2 so2 + o2 = 2so3
so3 + h2o = h2so4
h2so4 + cacl2 = caso4 + 2hcl
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