fe-feoh3-fe2o3-fe-fecl3-fe2o3
p-p2o5-h3po4-ca3(po4)2-h3po4
сделать цепочку реакций
p-p2o5-h3po4-ca3(po4)2-h3po4
сделать цепочку реакций
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2Fe + 4H2O -> 2Fe(OH)3 + H2
2Fe(OH)3 -> Fe2O3 + 3H2O
Fe2O3 + 2Al -> Al2O3 + 2Fe
2Fe + 3Cl2 -> 2FeCl3
2FeCl3 + 3MgO -> 3MgCl2 + Fe2O3
4P + 5O2 -> 2P2O5
P2O5 + 3H2O -> 2H3PO4
2H3PO4 + 3Ca -> Ca3(PO4)2 + 3H2
Ca3(PO4)2 + 6HNO3 -> 3Ca(NO3)2 + 2H3PO4