1) 4K + O2 → 2K2O (4:1:2)
2) 2Al +3S→ Al2S3 (2:3:1)
3) 2SO2 + O2 → 2 SO3 (2:1:2)
4)Fe2O3 + 6HNO3 → 2Fe(NO3)3 + 3H2O (1:6:2:3)
5)2K + 2H2O → 2KOH + H2 (2:2:2:1)
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6) Al2(SO4)3 + 6NaOH → 2Al(OH)3 + 3Na2SO4 (1:6:2:3)
7) C2H6O + 3O2 → 2CO2 + 3H2O (1:3:2:3)
8) 2FeCl2 +3Cl2 → 2FeCl3 (2:3:2)
9) 4NO2 + O2 + 2H2O → 4HNO3 (4:1:2:4)
10) CnH2n + \(\dfrac{3n}{2}\)O2 → nCO2 + nH2O (1:\(\dfrac{3n}{2}\):n:n)
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