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10FeS + 6KMnO4 → 5Fe2O3 + 10S + 6MnO + 3K2O

The reaction of iron(II) sulfide and potassium permanganate yields iron(III) oxide, sulfur, manganese(II) oxide, and potassium oxide (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
FeSIron(II) sulfide10
Reducing
Reducing
KMnO4Potassium permanganate6
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Fe2O3Iron(III) oxide5
Oxidized
SSulfur10
Oxidized
MnOManganese(II) oxide6
Reduced
K2OPotassium oxide3

Thermodynamic changes

Changes in standard condition (1)

Reaction of iron(II) sulfide and potassium permanganate
ΔrG−1425.1 kJ/mol
K4.64 × 10249
pK−249.67
10FeSCrystalline solidiron-rich pyrrhotite, α + 6KMnO4Crystalline solid
5Fe2O3Crystalline solid + 10SCrystalline solidrhombic + 6MnOCrystalline solid + 3K2OCrystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−1493.6−1425.1−237.658.6
per 1 mol of
−149.36−142.51−23.765.86
−248.93−237.52−39.609.77
per 1 mol of
−298.72−285.02−47.5211.7
per 1 mol of
−149.36−142.51−23.765.86
−248.93−237.52−39.609.77
per 1 mol of
−497.87−475.03−79.2019.5

Changes in standard condition (2)

Reaction of iron(II) sulfide and potassium permanganate
10FeSCrystalline solidiron-rich pyrrhotite, α + 6KMnO4Crystalline solid
5Fe2O3Crystalline solid + 10SCrystalline solidmonoclinic + 6MnOCrystalline solid + 3K2OCrystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−1490.3
per 1 mol of
−149.03
−248.38
per 1 mol of
−298.06
per 1 mol of
−149.03
−248.38
per 1 mol of
−496.77

Changes in aqueous solution

Reaction of iron(II) sulfide and potassium permanganate
ΔrG−1467.7 kJ/mol
K1.35 × 10257
pK−257.13
10FeSCrystalline solidiron-rich pyrrhotite, α + 6KMnO4Ionized aqueous solution
5Fe2O3Crystalline solid + 10SCrystalline solidrhombic + 6MnOCrystalline solid + 3K2OCrystalline solid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−1754.0−1467.7−969.51125.2
per 1 mol of
−175.40−146.77−96.95112.52
−292.33−244.62−161.6187.53
per 1 mol of
−350.80−293.54−193.9225.04
per 1 mol of
−175.40−146.77−96.95112.52
−292.33−244.62−161.6187.53
per 1 mol of
−584.67−489.23−323.2375.07

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
FeS (cr)
iron-rich pyrrhotite, α
-100.0[1]-100.4[1]60.29[1]50.54[1]
KMnO4 (cr)-837.2[1]-737.6[1]171.71[1]117.57[1]
KMnO4 (ai)-793.8[1]-730.5[1]293.7[1]-60.2[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
Fe2O3 (cr)-824.2[1]-742.2[1]87.40[1]103.85[1]
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]
S (g)278.805[1]238.250[1]167.821[1]23.673[1]
MnO (cr)-385.22[1]-362.90[1]59.71[1]45.44[1]
MnO (g)124.22[1]
K2O (cr)-361.5[1]-322.1[2]94.1[2]83.7[2]
K2O (g)-63[1]
* (cr):Crystalline solid, (g):Gas

References

List of references

  1. 1
  2. 2
    James G. Speight (2017)
    Lange's Handbook of Chemistry, 17th edition
    McGraw Hill Education