2NH3+6Na=2Na3N+3H2
Na2O+2HCl=2NaCl+H2O
2NaCl+2H2Oэлектролиз раствора=H2+2NaOH+Cl2
2NaOH+CO2=Na2CO3+H2O
Na2O+H2SO4=Na2SO4+H2O
4Cr+3O2=2Cr2O3
Cr2O3+6HNO3=2Cr(NO3)3+3H2O
Cr(NO3)3+3NaOH=Cr(OH)3+3NaNO3
2Cr(OH)3+3H2SO4=Cr2(SO4)3+6H2O
2Cr+3S=Cr2S3
Cr2O3+6HBr=2CrBr3+3H2O