Решить:
Mg + H2SO4 =>
Fe + H2SO4 =>
CuO + H2SO4=>
Уровнять:
Cu(OH)2 + H2SO4 => CuSO4 + H2O
Дописать, составить и решить ионное уравнение 
BaCl2 H2So4 => BaSO4 + ...
Na2CO3 + H2SO4 => CO2 + ...
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