\(\text{3Fe + 2O2 → Fe3O4}\)
\(\text{3H2 + N2 ↔ 2NH3}\)
\(\text{2Al + 3Cl2 → 2AlCl3}\)
\(\text{2H2O + 2K → H2 + 2KOH}\)
3Fe+2O2---->Fe3O4
N2+3H2----->.2NH3
2Al+3Cl2--->2AlCl3
2K+2H2O--->2KOH+H2
3Fe + 2O2---------> Fe3O4
N2 + 3H2 -----------> 2NH3
2Al + 3Cl2 ---------->2AlCl3