Balancing Chemical Equations: Problem List

Problems 1-10      Problems 11-25      Problems 26-45      Problems 46-65
Six "balancing by groups" problems      Fifteen examples      Return to Equations Menu
Sixteen balance redox equations by sight

Discussion and fifteen examples

Example #1: H2 + O2 ---> H2O

Example #2: H2 + Cl2 ---> HCl

Example #3: O2 ---> O3

Example #4: Na + H2O ---> NaOH + H2

Example #5: Fe + CuSO4 --> Cu + FeSO4

Example #6: Zn + HCl ---> ZnCl2 + H2

Example #7: KClO3 ---> KCl + O2

Example #8: S8 + F2 ---> SF6

Example #9: Fe + O2 ---> Fe2O3

Example #10: C2H6 + O2 ---> CO2 + H2O

Example #11-13: Balance these three equations using fractional coefficients:

S8 + F2 ---> SF6

C4H10 + O2 ---> CO2 + H2O

S8 + O3 ---> SO2

Example #14: H2 + O3 ---> H2O (You must balance it with one restriction: the coefficient in front of the water must be a one.)

Example #15: KFe3AlSi3O10(OH)2 + Cu + O2 + H2S ---> KAlSi3O8 + CuFeS2 + H2O

Example #16: SiO2 + CaC2 ---> Si + CaO + CO2


Problems 1-10

Problem #1: FeCl3 + MgO ---> Fe2O3 + MgCl2

Problem #2: Li + H3PO4 ---> H2 + Li3PO4

Problem #3: ZnS + O2 ---> ZnO + SO2

Problem #4: FeS2 + Cl2 ---> FeCl3 + S2Cl2

Problem #5: Fe + HC2H3O2 ---> Fe(C2H3O2)3 + H2

Problem #6: H2(g) + V2O5(s) ---> V2O3(s) + H2O(ℓ)

Problem #7: HCl(aq) + MnO2(s) ---> MnCl2(aq) + Cl2(g) + H2O(ℓ)

Problem #8: Fe2O3(s) + C(s) ---> Fe(s) + CO2(g)

Problem #9: C5H11NH2 + O2 ---> CO2 + H2O + NO2

Problem #10: CO2 + S8 ---> CS2 + SO2

Bonus Problem: P4 + O2 ---> P2O3


Problems 11-25

Problem #11: NH3(g) + N2O(g) ---> N2(g) + H2O(g)

Problem #12: NH3 + O2 ---> NO + H2O

Problem #13: NH3 + Cl2 ---> N2H4 + NH4Cl

Problem #14: NH3 + F2 ---> N2F4 + HF

Problem #15: NH3 + F2 ---> NH4F + NF3

Problem #16: NH4NO3(s) ---> N2(g) + O2(g) + H2O(g)

Problem #17: N2O + CH4 ---> N2 + CO2 + H2O

Problem #18: NO2 + O2 + H2O ---> HNO3

Problem #19: NO2 + H2O ----> HNO3 + NO

Problem #20: N2(g) + O2(g) + H2O ---> HNO3

Problem #21: N2H4 + N2O4 ---> N2 + H2O

Problem #22: N2H4 + H2O2 ---> N2 + H2O

Problem #23: N2O4 + H2O ---> HNO3 + NO

Problem #24: NaOH + Al --> Al2O3 + H2 + Na2O

Problem #25: KMnO4 ---> K2O + MnO + O2


Problems 26-45

Problem #26: Ca(AlO2)2(s) + HCl (aq) ---> AlCl3(aq) + CaCl2(aq) + H2O(ℓ)

Problem #27: C6H6 + H2O2 ---> CO2 + H2O

Problem #28: Fe + O2 + H2O ---> Fe(OH)2

Problem #29: MgNH4PO4 ---> Mg2P2O7 + NH3 + H2O

Problem #30: AlCl3(s) + Ca3N2(s) ---> AlN(s) + CaCl2(s)

Problem #31: HNCO ---> C3N3(NH2)3 + CO2

Problem #32: K4Fe(CN)6 + H2SO4 + H2O ---> K2SO4 + FeSO4 + (NH4)2SO4 + CO

Problem #33: KAlSi3O8 + CO2 + H2O ---> Al2Si2O5(OH)4 + H4SiO4 + KHCO3

Problem #34: CH3CCl3 + O2 ---> CO2 + H2O + Cl2

Problem #35: CO + Fe3O4 ---> CO2 + Fe

Problem #36: H2S + CO -----> CH3COOH + S8

Problem #37: H2S(g) + SO2(g) ---> S8(s) + H2O(g)

Problem #38: FeSO4 ---> Fe2O3 + SO2 + SO3

Problem #39: Pb(NO3)2 + FeCl3 ---> Fe(NO3)3 + PbCl2

Problem #40: C3H5(NO3)3 ---> CO2 + H2O + N2 + O2

Problem #41: CO(NH2)2 + NO2 ---> CO2 + H2O + N2

Problem #42: C2H2 + O2 ---> CO2 + H2O

Problem #43: Ag2O + NH4OH + NH4NO3 ----> [Ag(NH3)2]NO3 + H2O

Problem #44: HClO4 + P4O10 ---> H3PO4 + Cl2O7

Problem #45: C4H10S + O2 ---> CO2 + H2O + SO2


Problems 46-65

Problem #46: NaBH4 + BF3 ---> NaBF4 + B2H6

Problem #47: C5H7O + O2 ---> CO2 + H2O

Problem #48: NaOH + P4 + H2O ---> NaH2PO2 + PH3

Problem #49: NBr3 + NaOH ----> N2 + NaBr + HOBr

Problem #50: VO + Fe2O3 ---> FeO + V2O5

Problem #51: Fe2O3(s) + CO(g) ---> Fe(s) + CO2(g)

Problem #52: S2H5 + O2 ---> SO2 + H2O

Problem #53: KOH + F2 ---> KF + F2O + H2O

Problem #54: Al + KOH + H2SO4 + H2O ----> KAl(SO4)2 · 12H2O + H2

Problem #55: KAl(SO4)2 · 12H2O + BaCl2 ---> KCl + AlCl3 + BaSO4 + H2O

Problem #56: C10H22 ---> C4H10 + C2H4

Problem #57: NH2CH2COOH(s) + O2(g) ---> CO2(g) + H2O(ℓ) + N2(g)

Problem #58: C3H5O9N3 ---> CO2 + N2 + O2 + H2O

Problem #59: C20H45 + O2 ---> CO2 + H2O

Problem #60: C3H5 + O2 ---> CO2 + H2O

Problem #61: C5H11SO2N + O2 ---> CO2 + H2O + SO2 + NO2

Problem #62: Ca(OH)2 + C4H6O5 ---> H2O + CaC4H4O5

Problem #63: FeTiO3 + Cl2 + C ---> TiCl4 + FeCl3 + CO

Problem #64: Ca3P2(s) + H2O(ℓ) ---> Ca(OH)2(aq) + PH3(g)

Problem #65: TiCl4(ℓ) + H2O(ℓ) ---> TiO2(s) + HCl(aq)

Problem #66: Cu2O + O2 ---> CuO

Bonus Problem: Na2CO3 + C + N2 ---> NaCN + CO2


Problems 1-10      Problems 11-25      Problems 26-45      Problems 46-65
Six "balancing by groups" problems      Fifteen examples      Return to Equations Menu
Sixteen balance redox equations by sight