ПРОШУ!!СРОЧНО ПОЖАЛУЙСТА ПОМОГИТЕ!СОСТАВЬТЕ УРАВНЕНИЯ РЕАКЦИЙ ПО СХЕМАМ:
ж)Fe2(SO4)3-->Fe(OH)3-->Fe2O3-->Fe2(SO4)3
з)P-->P2O5-->H3PO4-->Ca3(PO4)2-->H3PO4-->Ca(H2PO4)2
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