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Chemical reactions
8FeSe + 6KMnO4 → 4Fe2O3 + 5Se + 6MnO2 + 3K2Se

8FeSe + 6KMnO₄ → 4Fe₂O₃ + 5Se + 6MnO₂ + 3K₂Se

Last updated: June 13, 2022

Reaction of iron(II) selenide and potassium permanganate: 8FeSeIron(II) selenide + 6KMnO₄Potassium permanganate
⟶
4Fe₂O₃Iron(III) oxide + 5SeSelenium + 6MnO₂Manganese(IV) oxide + 3K₂SePotassium selenide

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

Reaction of reducing species and oxidizing species

Table of contents

Reaction data

Chemical equation

Reaction of iron(II) selenide and potassium permanganate: 8FeSeIron(II) selenide + 6KMnO₄Potassium permanganate
⟶
4Fe₂O₃Iron(III) oxide + 5SeSelenium + 6MnO₂Manganese(IV) oxide + 3K₂SePotassium selenide

General equation

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

Oxidation state of each atom

Reaction of iron(II) selenide and potassium permanganate

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
FeSe	Iron(II) selenide	8	Reducing	Reducing
KMnO₄	Potassium permanganate	6	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
Fe₂O₃	Iron(III) oxide	4	Oxidized	–
Se	Selenium	5	Oxidized	–
MnO₂	Manganese(IV) oxide	6	Reduced	–
K₂Se	Potassium selenide	3	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidhexagonal, gray + 6MnO₂Crystalline solid + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1976.4	–	–	–
per 1 mol of Iron(II) selenide	−247.05	–	–	–
per 1 mol of Potassium permanganate	−329.40	–	–	–
per 1 mol of Iron(III) oxide	−494.10	–	–	–
per 1 mol of Selenium	−395.28	–	–	–
per 1 mol of Manganese(IV) oxide	−329.40	–	–	–
per 1 mol of Potassium selenide	−658.80	–	–	–

Changes in standard condition (2)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidhexagonal, gray + 6MnO₂Amorphous solidprecipitated + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1871.2	–	–	–
per 1 mol of Iron(II) selenide	−233.90	–	–	–
per 1 mol of Potassium permanganate	−311.87	–	–	–
per 1 mol of Iron(III) oxide	−467.80	–	–	–
per 1 mol of Selenium	−374.24	–	–	–
per 1 mol of Manganese(IV) oxide	−311.87	–	–	–
per 1 mol of Potassium selenide	−623.73	–	–	–

Changes in standard condition (3)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidmonoclinic, red + 6MnO₂Crystalline solid + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1942.9	–	–	–
per 1 mol of Iron(II) selenide	−242.86	–	–	–
per 1 mol of Potassium permanganate	−323.82	–	–	–
per 1 mol of Iron(III) oxide	−485.73	–	–	–
per 1 mol of Selenium	−388.58	–	–	–
per 1 mol of Manganese(IV) oxide	−323.82	–	–	–
per 1 mol of Potassium selenide	−647.63	–	–	–

Changes in standard condition (4)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidmonoclinic, red + 6MnO₂Amorphous solidprecipitated + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1837.7	–	–	–
per 1 mol of Iron(II) selenide	−229.71	–	–	–
per 1 mol of Potassium permanganate	−306.28	–	–	–
per 1 mol of Iron(III) oxide	−459.43	–	–	–
per 1 mol of Selenium	−367.54	–	–	–
per 1 mol of Manganese(IV) oxide	−306.28	–	–	–
per 1 mol of Potassium selenide	−612.57	–	–	–

Changes in standard condition (5)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidhexagonal, gray + 6MnO₂Crystalline solid + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−2070.0	–	–	–
per 1 mol of Iron(II) selenide	−258.75	–	–	–
per 1 mol of Potassium permanganate	−345.00	–	–	–
per 1 mol of Iron(III) oxide	−517.50	–	–	–
per 1 mol of Selenium	−414.00	–	–	–
per 1 mol of Manganese(IV) oxide	−345.00	–	–	–
per 1 mol of Potassium selenide	−690.00	–	–	–

Changes in standard condition (6)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidhexagonal, gray + 6MnO₂Amorphous solidprecipitated + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1964.8	–	–	–
per 1 mol of Iron(II) selenide	−245.60	–	–	–
per 1 mol of Potassium permanganate	−327.47	–	–	–
per 1 mol of Iron(III) oxide	−491.20	–	–	–
per 1 mol of Selenium	−392.96	–	–	–
per 1 mol of Manganese(IV) oxide	−327.47	–	–	–
per 1 mol of Potassium selenide	−654.93	–	–	–

Changes in standard condition (7)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidmonoclinic, red + 6MnO₂Crystalline solid + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−2036.5	–	–	–
per 1 mol of Iron(II) selenide	−254.56	–	–	–
per 1 mol of Potassium permanganate	−339.42	–	–	–
per 1 mol of Iron(III) oxide	−509.13	–	–	–
per 1 mol of Selenium	−407.30	–	–	–
per 1 mol of Manganese(IV) oxide	−339.42	–	–	–
per 1 mol of Potassium selenide	−678.83	–	–	–

Changes in standard condition (8)

Reaction of iron(II) selenide and potassium permanganate: 8FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidmonoclinic, red + 6MnO₂Amorphous solidprecipitated + 3K₂SeCrystalline solid

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	−1931.3	–	–	–
per 1 mol of Iron(II) selenide	−241.41	–	–	–
per 1 mol of Potassium permanganate	−321.88	–	–	–
per 1 mol of Iron(III) oxide	−482.82	–	–	–
per 1 mol of Selenium	−386.26	–	–	–
per 1 mol of Manganese(IV) oxide	−321.88	–	–	–
per 1 mol of Potassium selenide	−643.77	–	–	–

Changes in aqueous solution

Reaction of iron(II) selenide and potassium permanganate: 8FeSeCrystalline solid + 6KMnO₄Ionized aqueous solution
⟶
4Fe₂O₃Crystalline solid + 5SeCrystalline solidhexagonal, gray + 6MnO₂Crystalline solid + 3K₂SeIonized aqueous solution

	Standard enthalpy of reaction Δ_rH° kJ · mol⁻¹	Standard Gibbs energy of reaction Δ_rG° kJ · mol⁻¹	Standard entropy of reaction Δ_rS° J · K⁻¹ · mol⁻¹	Standard heat capacity of reaction at constant pressure Δ_rC_p° J · K⁻¹ · mol⁻¹
per 1 mol of Equation	–	–	–	–
per 1 mol of Iron(II) selenide	–	–	–	–
per 1 mol of Potassium permanganate	–	–	–	–
per 1 mol of Iron(III) oxide	–	–	–	–
per 1 mol of Selenium	–	–	–	–
per 1 mol of Manganese(IV) oxide	–	–	–	–
per 1 mol of Potassium selenide	–	–	–	–

Thermodynamic data of reactants

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
FeSe (cr)	-75.3^[1]	–	–	–
FeSe (am)	-63.6^[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, (am):Amorphous solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formula	Standard enthalpy of formation Δ_fH° kJ · mol⁻¹	Standard Gibbs energy of formation Δ_fG° kJ · mol⁻¹	Standard molar entropy S° J · K⁻¹ · mol⁻¹	Standard molar heat capacity at constant pressure C_p° J · K⁻¹ · mol⁻¹
Fe₂O₃ (cr)	-824.2^[1]	-742.2^[1]	87.40^[1]	103.85^[1]
Se (cr) hexagonal, gray	0^[1]	0^[1]	42.442^[1]	25.363^[1]
Se (cr) monoclinic, red	6.7^[1]	–	–	–
Se (vit)	5.0^[1]	–	–	–
Se (g)	227.07^[1]	187.03^[1]	176.72^[1]	20.820^[1]
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[1]	–	–	–
K₂Se (cr)	-395.0^[1]	–	–	–
K₂Se (ai)	–	-437.2^[1]	–	–
K₂Se (cr) 9 hydrate	-3087.0^[1]	–	–	–
K₂Se (cr) 14 hydrate	-4524.2^[1]	–	–	–
K₂Se (cr) 19 hydrate	-5991.9^[1]	–	–	–

* (cr):Crystalline solid, (vit):Vitreous liquid, (g):Gas, (am):Amorphous solid, (ai):Ionized aqueous solution

References

List of references

1
Janiel J. Reed (1989)
The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
https://doi.org/10.18434/M32124
National Institute of Standards and Technology (NIST)
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