Сa----->CaO------>Ca(OH)2------>CaBr----->CaCO3
2Сa + O₂ = 2CaO CaO + H₂O = Ca(OH)₂ Ca(OH)₂ + 2HBr = CaBr₂ + 2H₂O CaBr₂ + Na₂CO₃ = CaCO₃ + 2NaBr
спасибо