S+O2------>SO2
2N2+3O2--------->2N2O3
2N2+5O2----------->2N2O5
4Cr+3O2----------->2Cr2O3
SnO2+C------->Sn+CO2
Fe2O3+3CO------------>2Fe+3CO2
2NO+2H2------------->N2+2H2O
3Mg+Fe2O3------------>3MgO+2Fe
P4O10+5C------------>P4+5CO2
4Li+O2----------->2Li2O