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2Mn2O3 + O2 → 4MnO2

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Reaction of manganese(III) oxide and oxygen
2Mn2O3Manganese(III) oxide + O2Oxygen
⟶
4MnO2Manganese(IV) oxide

The reaction of manganese(III) oxide and oxygen yields manganese(IV) oxide. 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 categories

Reaction data

Chemical equation

Reaction of manganese(III) oxide and oxygen
2Mn2O3Manganese(III) oxide + O2Oxygen
⟶
4MnO2Manganese(IV) oxide

General equation

Reaction of oxidizable species and oxidizing species
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of manganese(III) oxide and oxygen

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Mn2O3Manganese(III) oxide2
Reducing
Oxidizable
O2Oxygen1
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
MnO2Manganese(IV) oxide4
Redoxed product
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of manganese(III) oxide and oxygen
◆
ΔrG−98.4 kJ/mol
K1.73 × 1017
pK−17.24
2Mn2O3Crystalline solid + O2Gas
⟶
4MnO2Crystalline 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
−162.1−98.4−213.9−28.10
−81.05−49.2−107.0−14.05
per 1 mol of
−162.1−98.4−213.9−28.10
−40.52−24.6−53.48−7.025

Changes in standard condition (2)

Reaction of manganese(III) oxide and oxygen
2Mn2O3Crystalline solid + O2Gas
⟶
4MnO2Amorphous solidprecipitated
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
−92.0–––
−46.0–––
per 1 mol of
−92.0–––
−23.0–––

Changes in aqueous solution

Reaction of manganese(III) oxide and oxygen
◆
ΔrG−114.8 kJ/mol
K1.29 × 1020
pK−20.11
2Mn2O3Crystalline solid + O2Un-ionized aqueous solution
⟶
4MnO2Crystalline 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
−150.4−114.8−119.7–
−75.20−57.40−59.85–
per 1 mol of
−150.4−114.8−119.7–
−37.60−28.70−29.93–

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
Mn2O3 (cr)-959.0[1]-881.1[1]110.5[1]107.65[1]
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]–
* (cr):Crystalline solid, (g):Gas, (ao):Un-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
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

References

List of references

  1. 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
    National Institute of Standards and Technology (NIST)