1.Ca-> Ca O-> Ca(OH)2->Ca3(PO4)2


2.P->P2O5->H3PO4->Mg3(PO4)2


3. Mg->MgO->Mg(NO3)2->Mg(OH)2->MgO


4. C-> CO2->H2CO3->MgCO3

Кто сколько сможет пожалуйста
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