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6AsCl3 + 8MnO2 → 3As2O5 + Cl2O↑ + 8MnCl2

6AsCl₃ + 8MnO₂ → 3As₂O₅ + Cl₂O↑ + 8MnCl₂

Last updated: June 13, 2022

Reaction of arsenic trichloride and manganese(IV) oxide: 6AsCl₃Arsenic trichloride + 8MnO₂Manganese(IV) oxide
⟶
3As₂O₅Diarsenic pentaoxide + Cl₂O↑Dichlorine monoxide + 8MnCl₂Manganese(II) chloride

The reaction of arsenic trichloride and manganese(IV) oxide yields diarsenic pentaoxide, dichlorine monoxide, and manganese(II) chloride (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 arsenic trichloride and manganese(IV) oxide: 6AsCl₃Arsenic trichloride + 8MnO₂Manganese(IV) oxide
⟶
3As₂O₅Diarsenic pentaoxide + Cl₂O↑Dichlorine monoxide + 8MnCl₂Manganese(II) chloride

General equation

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

Oxidation state of each atom

Reaction of arsenic trichloride and manganese(IV) oxide

Reactants

Chemical formula	Name	Coefficient	Type	Type in general equation
AsCl₃	Arsenic trichloride	6	Reducing	Reducing
MnO₂	Manganese(IV) oxide	8	Oxidizing	Reducible

Products

Chemical formula	Name	Coefficient	Type	Type in general equation
As₂O₅	Diarsenic pentaoxide	3	Oxidized	–
Cl₂O	Dichlorine monoxide	1	Oxidized	–
MnCl₂	Manganese(II) chloride	8	Reduced	–

Thermodynamic changes

Changes in standard condition (1)

Reaction of arsenic trichloride and manganese(IV) oxide ◆ Δ_rG −495.5 kJ/mol K 6.42 × 10⁸⁶ pK −86.81: 6AsCl₃Liquid + 8MnO₂Crystalline solid
⟶
3As₂O₅Crystalline solid + Cl₂O↑Gas + 8MnCl₂Crystalline 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	−554.4	−495.5	−193.9	–
per 1 mol of Arsenic trichloride	−92.40	−82.58	−32.32	–
per 1 mol of Manganese(IV) oxide	−69.30	−61.94	−24.24	–
per 1 mol of Diarsenic pentaoxide	−184.8	−165.2	−64.63	–
per 1 mol of Dichlorine monoxide	−554.4	−495.5	−193.9	–
per 1 mol of Manganese(II) chloride	−69.30	−61.94	−24.24	–

Changes in standard condition (2)

Reaction of arsenic trichloride and manganese(IV) oxide: 6AsCl₃Liquid + 8MnO₂Amorphous solidprecipitated
⟶
3As₂O₅Crystalline solid + Cl₂O↑Gas + 8MnCl₂Crystalline 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	−694.6	–	–	–
per 1 mol of Arsenic trichloride	−115.8	–	–	–
per 1 mol of Manganese(IV) oxide	−86.83	–	–	–
per 1 mol of Diarsenic pentaoxide	−231.5	–	–	–
per 1 mol of Dichlorine monoxide	−694.6	–	–	–
per 1 mol of Manganese(II) chloride	−86.83	–	–	–

Changes in aqueous solution (1)

Reaction of arsenic trichloride and manganese(IV) oxide: 6AsCl₃Liquid + 8MnO₂Crystalline solid
⟶
3As₂O₅Aqueous solution + Cl₂O↑Gas + 8MnCl₂Ionized 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	−1224.1	–	–	–
per 1 mol of Arsenic trichloride	−204.02	–	–	–
per 1 mol of Manganese(IV) oxide	−153.01	–	–	–
per 1 mol of Diarsenic pentaoxide	−408.03	–	–	–
per 1 mol of Dichlorine monoxide	−1224.1	–	–	–
per 1 mol of Manganese(II) chloride	−153.01	–	–	–

Changes in aqueous solution (2)

Reaction of arsenic trichloride and manganese(IV) oxide: 6AsCl₃Liquid + 8MnO₂Crystalline solid
⟶
3As₂O₅Aqueous solution + Cl₂O↑Gas + 8MnCl₂Un-ionized 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 Arsenic trichloride	–	–	–	–
per 1 mol of Manganese(IV) oxide	–	–	–	–
per 1 mol of Diarsenic pentaoxide	–	–	–	–
per 1 mol of Dichlorine monoxide	–	–	–	–
per 1 mol of Manganese(II) chloride	–	–	–	–

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
AsCl₃ (l)	-305.0^[1]	-259.4^[1]	216.3^[1]	–
AsCl₃ (g)	-261.5^[1]	-248.9^[1]	327.17^[1]	75.73^[1]
MnO₂ (cr)	-520.03^[1]	-465.14^[1]	53.05^[1]	54.14^[1]
MnO₂ (am) precipitated	-502.5^[1]	–	–	–

* (l):Liquid, (g):Gas, (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]	–	–	–
Cl₂O (g)	80.3^[1]	97.9^[1]	266.21^[1]	45.40^[1]
MnCl₂ (cr)	-481.29^[1]	-440.50^[1]	118.24^[1]	72.93^[1]
MnCl₂ (g)	-263.6^[1]	–	–	–
MnCl₂ (ai)	-555.05^[1]	-490.8^[1]	38.9^[1]	-222^[1]
MnCl₂ (ao)	–	-492.0^[1]	–	–
MnCl₂ (cr) 1 hydrate	-789.9^[1]	-696.1^[1]	174.1^[1]	–
MnCl₂ (cr) 2 hydrate	-1092.0^[1]	-942.1^[1]	218.8^[1]	–
MnCl₂ (cr) 4 hydrate	-1687.4^[1]	-1423.6^[1]	303.3^[1]	–

* (cr):Crystalline solid, (aq):Aqueous solution, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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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