2BaMnO4 + 2e− → 2BaO + MnO2 + MnO42−
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- Reduction of barium manganate
- 2BaMnO4Barium manganate + 2e−Electron2BaOBarium oxide + MnO2Manganese(IV) oxide + MnO42−Manganate ion⟶
Reduction of barium manganate yields barium oxide, manganese(IV) oxide, and manganate ion (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reduction of barium manganate
- 2BaMnO4Barium manganate + 2e−Electron2BaOBarium oxide + MnO2Manganese(IV) oxide + MnO42−Manganate ion⟶
General equation
- Reduction of reducible species
- ReactantOxidizing agent + e− ⟶ ProductReduction product
Oxidation state of each atom
- Reduction of barium manganate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| BaMnO4 | Barium manganate | 2 | Oxidizing | – |
| e− | Electron | 2 | – | Electron |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| BaO | Barium oxide | 2 | – | – |
| MnO2 | Manganese(IV) oxide | 1 | Reduced | – |
| MnO42− | Manganate ion | 1 | – | – |
Thermodynamic changes
Changes in standard condition
- Reduction of barium manganate◆
ΔrG 222.4 kJ/mol K 0.11 × 10−38 pK 38.96
| 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 | – | 222.4 | – | – |
per 1 mol of | – | 111.2 | – | – |
per 1 mol of Electron | – | 111.2 | – | – |
per 1 mol of | – | 111.2 | – | – |
per 1 mol of | – | 222.4 | – | – |
per 1 mol of Manganate ion | – | 222.4 | – | – |
Thermodynamic data of reactants
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| BaMnO4 (cr) | – | -1119.2[1] | – | – |
| e− | – | – | – | – |
* (cr):Crystalline solid
Thermodynamic data of products
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| BaO (cr) | -553.5[1] | -525.1[1] | 70.42[1] | 47.78[1] |
| BaO (g) | -117[1] | – | – | 33.1[1] |
| MnO2 (cr) | -520.03[1] | -465.14[1] | 53.05[1] | 54.14[1] |
| MnO2 (am) precipitated | -502.5[1] | – | – | – |
| MnO42− (ao) | -653[1] | -500.7[1] | 59[1] | – |
* (cr):Crystalline solid, (g):Gas, (am):Amorphous solid, (ao):Un-ionized aqueous solution
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
- ^ ΔfG°, -1119.2 kJ · mol−1
- ^ ΔfH°, -553.5 kJ · mol−1
- ^ ΔfG°, -525.1 kJ · mol−1
- ^ S°, 70.42 J · K−1 · mol−1
- ^ Cp°, 47.78 J · K−1 · mol−1
- ^ ΔfH°, -117. kJ · mol−1
- ^ Cp°, 33.1 J · K−1 · mol−1
- ^ ΔfH°, -520.03 kJ · mol−1
- ^ ΔfG°, -465.14 kJ · mol−1
- ^ S°, 53.05 J · K−1 · mol−1
- ^ Cp°, 54.14 J · K−1 · mol−1
- ^ ΔfH°, -502.5 kJ · mol−1
- ^ ΔfH°, -653. kJ · mol−1
- ^ ΔfG°, -500.7 kJ · mol−1
- ^ S°, 59. J · K−1 · mol−1