Hoàn thành các PTPU sau:
1. CaO + H3PO4 ------> Ca3(PO4)2 +H2O
2. Fe3O4 + HCl -----> FeCl3 + FeCl2 + H2O
3. HCl +CaCO3-----> CaCl2+H2O
4.C4H10+O2-----> CO2+ H2O
5.NaOH+Fe2(SO4)3-----> Fe(OH)3+Na2SO4
6.FeS2+O2-----> Fe2O3+ SO2
7.KOH+Al2(SO4)3-----> K2SO4+Al(OH)3
8.CH4+O2+H2O-----> CO2+ H2
9.AL+Fe3O4-----> Al2O3+Fe