cl2o7+h2o
liho+h2s=
P + Na(OH) + H20 = NaH2PO2 + PH3
2 PbO + C -> 2 Pb + CO2
42
89
Balanced equation:12 HClO4 + P4O10 = 4 H3PO4 + 6 Cl2O7
Oxidation numbers up to +7 is possible. For example: +7 for Cl in HClO4 or Cl2O7. +6 for S in SO3 or H2SO4 +5 for N in HNO3 or N2O5 +4 for C in CO2
The balance is 2N2 +2O2= 4NO
2h2s + so2 ----------> 3s + 2h2o
Already balanced
Fe2O3 + H2SO4
liho+h2s=
2ZnS + 3O2 = 2ZnO + 2SO2
BaCl2 + K2SO4 --> BaSO4 + 2KCl
C3h8 + 5o2 -> 3co2 + 4h2o
4Li + O2 -> 2Li2O
2Al+3S--->Al2S3