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4As2S3 + 11MnO2 🔥→ 4As2O5 + SO2↑ + 11MnS

4As₂S₃ + 11MnO₂ 🔥→ 4As₂O₅ + SO₂↑ + 11MnS

Last updated: June 13, 2022

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Diarsenic trisulfide + 11MnO₂Manganese(IV) oxide
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4As₂O₅Diarsenic pentaoxide + SO₂↑Sulfur dioxide + 11MnSManganese(II) sulfide

The reaction of diarsenic trisulfide and manganese(IV) oxide yields diarsenic pentaoxide, sulfur dioxide, and manganese(II) sulfide (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Reaction of reducing species and reducible species

Table of contents

Reaction data

Chemical equation

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Diarsenic trisulfide + 11MnO₂Manganese(IV) oxide
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4As₂O₅Diarsenic pentaoxide + SO₂↑Sulfur dioxide + 11MnSManganese(II) sulfide

General equation

Reaction of reducing species and reducible species: Reducing speciesReducing agent + Reducible speciesOxidizing agent
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ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of diarsenic trisulfide and manganese(IV) oxide

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
As₂S₃	Diarsenic trisulfide	4	Reducing	Reducing
MnO₂	Manganese(IV) oxide	11	Oxidizing	Reducible

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
As₂O₅	Diarsenic pentaoxide	4	Oxidized	–
SO₂	Sulfur dioxide	1	Oxidized	–
MnS	Manganese(II) sulfide	11	Reduced	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of diarsenic trisulfide and manganese(IV) oxide ◆ Δ_rG −40.9 kJ/mol K 1.46 × 10⁷ pK −7.17: 4As₂S₃Crystalline solid + 11MnO₂Crystalline solid
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4As₂O₅Crystalline solid + SO₂↑Gas + 11MnSCrystalline solidgreen

	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	43.8	−40.9	292.1	−5.2
per 1 mol of Diarsenic trisulfide	10.9	−10.2	73.03	−1.3
per 1 mol of Manganese(IV) oxide	3.98	−3.72	26.55	−0.47
per 1 mol of Diarsenic pentaoxide	10.9	−10.2	73.03	−1.3
per 1 mol of Sulfur dioxide	43.8	−40.9	292.1	−5.2
per 1 mol of Manganese(II) sulfide	3.98	−3.72	26.55	−0.47

Changes in standard condition (2)

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Crystalline solid + 11MnO₂Crystalline solid
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4As₂O₅Crystalline solid + SO₂↑Gas + 11MnSAmorphous solidprecipitated, pink

	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	48.2	–	–	–
per 1 mol of Diarsenic trisulfide	12.1	–	–	–
per 1 mol of Manganese(IV) oxide	4.38	–	–	–
per 1 mol of Diarsenic pentaoxide	12.1	–	–	–
per 1 mol of Sulfur dioxide	48.2	–	–	–
per 1 mol of Manganese(II) sulfide	4.38	–	–	–

Changes in standard condition (3)

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Crystalline solid + 11MnO₂Amorphous solidprecipitated
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4As₂O₅Crystalline solid + SO₂↑Gas + 11MnSCrystalline solidgreen

	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	−149.0	–	–	–
per 1 mol of Diarsenic trisulfide	−37.25	–	–	–
per 1 mol of Manganese(IV) oxide	−13.55	–	–	–
per 1 mol of Diarsenic pentaoxide	−37.25	–	–	–
per 1 mol of Sulfur dioxide	−149.0	–	–	–
per 1 mol of Manganese(II) sulfide	−13.55	–	–	–

Changes in standard condition (4)

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Crystalline solid + 11MnO₂Amorphous solidprecipitated
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4As₂O₅Crystalline solid + SO₂↑Gas + 11MnSAmorphous solidprecipitated, pink

	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	−144.6	–	–	–
per 1 mol of Diarsenic trisulfide	−36.15	–	–	–
per 1 mol of Manganese(IV) oxide	−13.15	–	–	–
per 1 mol of Diarsenic pentaoxide	−36.15	–	–	–
per 1 mol of Sulfur dioxide	−144.6	–	–	–
per 1 mol of Manganese(II) sulfide	−13.15	–	–	–

Changes in aqueous solution (1)

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Crystalline solid + 11MnO₂Crystalline solid
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4As₂O₅Aqueous solution + SO₂↑Gas + 11MnSCrystalline solidgreen

	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	−62.3	–	–	–
per 1 mol of Diarsenic trisulfide	−15.6	–	–	–
per 1 mol of Manganese(IV) oxide	−5.66	–	–	–
per 1 mol of Diarsenic pentaoxide	−15.6	–	–	–
per 1 mol of Sulfur dioxide	−62.3	–	–	–
per 1 mol of Manganese(II) sulfide	−5.66	–	–	–

Changes in aqueous solution (2)

Reaction of diarsenic trisulfide and manganese(IV) oxide: 4As₂S₃Crystalline solid + 11MnO₂Crystalline solid
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4As₂O₅Aqueous solution + SO₂↑Un-ionized aqueous solution + 11MnSCrystalline solidgreen

	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	−88.4	–	–	–
per 1 mol of Diarsenic trisulfide	−22.1	–	–	–
per 1 mol of Manganese(IV) oxide	−8.04	–	–	–
per 1 mol of Diarsenic pentaoxide	−22.1	–	–	–
per 1 mol of Sulfur dioxide	−88.4	–	–	–
per 1 mol of Manganese(II) sulfide	−8.04	–	–	–

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
As₂S₃ (cr)	-169.0^[1]	-168.6^[1]	163.6^[1]	116.3^[1]
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[1]	–	–	–

* (cr):Crystalline solid, (am):Amorphous solid

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
As₂O₅ (cr)	-924.87^[1]	-782.3^[1]	105.4^[1]	116.52^[1]
As₂O₅ (aq)	-951.4^[1]	–	–	–
As₂O₅ (cr) 4 hydrate	-2104.6^[1]	–	–	–
SO₂ (l)	-320.5^[1]	–	–	–
SO₂ (g)	-296.830^[1]	-300.194^[1]	248.22^[1]	39.87^[1]
SO₂ (ao)	-322.980^[1]	-300.676^[1]	161.9^[1]	–
MnS (cr) green	-214.2^[1]	-218.4^[1]	78.2^[1]	49.96^[1]
MnS (am) precipitated, pink	-213.8^[1]	–	–	–

* (cr):Crystalline solid, (aq):Aqueous solution, (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution, (am):Amorphous solid

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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