Ответ:
Fe2O3+3 H2SO4 - Fe2(SO4)3+3 H2O
CaO+2HBr - CaBr2 + H2O
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Ответ:
Fe2O3+3 H2SO4 - Fe2(SO4)3+3 H2O
CaO+2HBr - CaBr2 + H2O