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Chemical reactions
10FeSe + 6KMnO4 → 5Fe2O3 + 7Se + 3Mn2O3 + 3K2Se

10FeSe + 6KMnO₄ → 5Fe₂O₃ + 7Se + 3Mn₂O₃ + 3K₂Se

Last updated: June 13, 2022

Reaction of iron(II) selenide and potassium permanganate: 10FeSeIron(II) selenide + 6KMnO₄Potassium permanganate
⟶
5Fe₂O₃Iron(III) oxide + 7SeSelenium + 3Mn₂O₃Manganese(III) oxide + 3K₂SePotassium selenide

The reaction of iron(II) selenide and potassium permanganate yields iron(III) oxide, selenium, manganese(III) 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: 10FeSeIron(II) selenide + 6KMnO₄Potassium permanganate
⟶
5Fe₂O₃Iron(III) oxide + 7SeSelenium + 3Mn₂O₃Manganese(III) 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	10	Reducing	Reducing
KMnO₄	Potassium permanganate	6	Oxidizing	Oxidizing

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
Fe₂O₃	Iron(III) oxide	5	Oxidized	–
Se	Selenium	7	Oxidized	–
Mn₂O₃	Manganese(III) oxide	3	Reduced	–
K₂Se	Potassium selenide	3	–	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of iron(II) selenide and potassium permanganate: 10FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
5Fe₂O₃Crystalline solid + 7SeCrystalline solidhexagonal, gray + 3Mn₂O₃Crystalline 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	−2406.8	–	–	–
per 1 mol of Iron(II) selenide	−240.68	–	–	–
per 1 mol of Potassium permanganate	−401.13	–	–	–
per 1 mol of Iron(III) oxide	−481.36	–	–	–
per 1 mol of Selenium	−343.83	–	–	–
per 1 mol of Manganese(III) oxide	−802.27	–	–	–
per 1 mol of Potassium selenide	−802.27	–	–	–

Changes in standard condition (2)

Reaction of iron(II) selenide and potassium permanganate: 10FeSeCrystalline solid + 6KMnO₄Crystalline solid
⟶
5Fe₂O₃Crystalline solid + 7SeCrystalline solidmonoclinic, red + 3Mn₂O₃Crystalline 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	−2359.9	–	–	–
per 1 mol of Iron(II) selenide	−235.99	–	–	–
per 1 mol of Potassium permanganate	−393.32	–	–	–
per 1 mol of Iron(III) oxide	−471.98	–	–	–
per 1 mol of Selenium	−337.13	–	–	–
per 1 mol of Manganese(III) oxide	−786.63	–	–	–
per 1 mol of Potassium selenide	−786.63	–	–	–

Changes in standard condition (3)

Reaction of iron(II) selenide and potassium permanganate: 10FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
5Fe₂O₃Crystalline solid + 7SeCrystalline solidhexagonal, gray + 3Mn₂O₃Crystalline 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	−2523.8	–	–	–
per 1 mol of Iron(II) selenide	−252.38	–	–	–
per 1 mol of Potassium permanganate	−420.63	–	–	–
per 1 mol of Iron(III) oxide	−504.76	–	–	–
per 1 mol of Selenium	−360.54	–	–	–
per 1 mol of Manganese(III) oxide	−841.27	–	–	–
per 1 mol of Potassium selenide	−841.27	–	–	–

Changes in standard condition (4)

Reaction of iron(II) selenide and potassium permanganate: 10FeSeAmorphous solid + 6KMnO₄Crystalline solid
⟶
5Fe₂O₃Crystalline solid + 7SeCrystalline solidmonoclinic, red + 3Mn₂O₃Crystalline 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	−2476.9	–	–	–
per 1 mol of Iron(II) selenide	−247.69	–	–	–
per 1 mol of Potassium permanganate	−412.82	–	–	–
per 1 mol of Iron(III) oxide	−495.38	–	–	–
per 1 mol of Selenium	−353.84	–	–	–
per 1 mol of Manganese(III) oxide	−825.63	–	–	–
per 1 mol of Potassium selenide	−825.63	–	–	–

Changes in aqueous solution

Reaction of iron(II) selenide and potassium permanganate: 10FeSeCrystalline solid + 6KMnO₄Ionized aqueous solution
⟶
5Fe₂O₃Crystalline solid + 7SeCrystalline solidhexagonal, gray + 3Mn₂O₃Crystalline 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(III) 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]
Mn₂O₃ (cr)	-959.0^[1]	-881.1^[1]	110.5^[1]	107.65^[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, (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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