Расставьте коэффициенты в приведенных схемах реакций .
а) Ca+N2=Ca3N2
б) Na+Cl2=NaCl
в) HgO=Hg+O2
г) Al+O2=Al2O3
д) P+Cl2=PCl5
е) NO2=NO+O2
ж) Fe3O4+Al=Fe+Al2O3
з) NH3+O2=N2+H2O
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