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1)Mg-->HgO-->MgCl2-->Mg(OH)2-->MgO-->Mg
2)P-->P2O5-->H3PO4-->Ca3(PO4)
1)Mg-->HgO-->MgCl2-->Mg(OH)2-->MgO-->Mg
2)P-->P2O5-->H3PO4-->Ca3(PO4)
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Answers & Comments
MgO+2HCl=MgCl2+H2O
MgCl2+2NaOH=Mg(OH)2+2NACl
Mg(OH)2=MgO+H2O
MgO+C=Mg+CO
4P+5O2=2P2O5
P2O5+3H2O=2H3PO4
2H3PO4+3CaCl2=Ca3(PO4)2+6HCL