3Zn(NO₃)₂ + 2K₃PO₄ = Zn₃(PO₄)₂↓ + 6KNO₃
3Zn²⁺ + 6NO₃⁻ + 6K⁺ + 2PO₄³⁻ = Zn₃(PO₄)₂↓ + 6K⁺ + 6NO₃-
3Zn²⁺ + 2PO₄³⁻ = Zn₃(PO₄)₂↓
Na₂SiO₃ + BaBr₂ = BaSiO₃↓ + 2NaBr
2Na⁺ + SiO₃ + Ba²⁺ + 2Br⁻ = BaSiO₃↓ + 2Na⁺ + 2Br⁻
Ba²⁺ + SiO₃ = BaSiO₃↓
C6H12O6=2C2H5OH+2CO2
C2H5OH+CuO=CH3CHO+Cu+H2O
2CH3CHO+5O2=4CO2+4H2O
571л (ф[o2]=0.21)------ 120/0.21=571