помогите пожалуйста.
Fe -> Fe2O3 ->(H2SO4) -> x -> BaSO4
Ca -> CaO -> Ca(OH)2 -> (HCl) -> x
Na -> NaOH -> Na2CO3 -> Na2SO4 -> NaCL -> NaNO3

Fe2O3 ->(H2SO4) -> x - это значит с использованием H2SO4 из Fe2O3 получилось вещество x
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