Question

Mg->MgO->Mg(OH)2->Mg(H2PO4)2->MgHPO4->Mg3(PO4)2

Answer 1

2Mg+O2=2MgO

MgO+H2O=Mg(OH)2

Mg(OH)2+2H3PO4 → Mg(H2PO4)2+2H2O

Mg(H2PO4)2 ↔ MgHPO4+H3PO4

3MgHPO4+3KOH=Mg3(PO4)2+K3PO4+3H2O

В третьем