3Li2SO3 🔥→ 2Li2SO4 + Li2O + S
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- Decomposition of lithium sulfite
Decomposition of lithium sulfite yields lithium sulfate, lithium oxide, and (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Decomposition of lithium sulfite
General equation
- Thermal decomposition with redox
- Thermally decomposable substanceSelf redox agent🔥⟶ ProductOxidation product + ProductReduction product
- Thermal decomposition of oxoacid salt with redox
- Oxoacid saltSelf redox agent🔥⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Decomposition of lithium sulfite
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Li2SO3 | Lithium sulfite | 3 | – | Thermally decomposable Oxoacid salt |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Li2SO4 | Lithium sulfate | 2 | Oxidized | – |
| Li2O | Lithium oxide | 1 | – | – |
| 1 | Reduced | – |
Thermodynamic changes
Changes in standard condition (1)
- Decomposition of lithium sulfite
| 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 | 60.1 | – | – | – |
per 1 mol of | 20.0 | – | – | – |
per 1 mol of | 30.1 | – | – | – |
per 1 mol of | 60.1 | – | – | – |
| 60.1 | – | – | – |
Changes in standard condition (2)
- Decomposition of lithium sulfite
| 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 | 60.4 | – | – | – |
per 1 mol of | 20.1 | – | – | – |
per 1 mol of | 30.2 | – | – | – |
per 1 mol of | 60.4 | – | – | – |
| 60.4 | – | – | – |
Changes in aqueous solution
- Decomposition of lithium sulfite
| 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 | 0.6 | – | – | – |
per 1 mol of | 0.20 | – | – | – |
per 1 mol of | 0.30 | – | – | – |
per 1 mol of | 0.60 | – | – | – |
| 0.60 | – | – | – |
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 |
|---|---|---|---|---|
| Li2SO3 (cr) | -1177.0[1] | – | – | – |
* (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 |
|---|---|---|---|---|
| Li2SO4 (cr) | -1436.49[1] | -1321.70[1] | 115.1[1] | 117.57[1] |
| Li2SO4 (ai) | -1466.24[1] | -1331.20[1] | 47.3[1] | -155.6[1] |
| Li2SO4 (cr) 1 hydrate | -1735.5[1] | -1565.5[1] | 163.6[1] | 151.08[1] |
| Li2O (cr) | -597.94[1] | -561.18[1] | 37.57[1] | 54.10[1] |
| Li2O (g) | -160.7[1] | -181.6[1] | 231.48[1] | 49.83[1] |
| (cr) rhombic | 0[1] | 0[1] | 31.80[1] | 22.64[1] |
| (cr) monoclinic | 0.33[1] | – | – | – |
| (g) | 278.805[1] | 238.250[1] | 167.821[1] | 23.673[1] |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas
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)
- ^ ΔfH°, -1177.0 kJ · mol−1
- ^ ΔfH°, -1436.49 kJ · mol−1
- ^ ΔfG°, -1321.70 kJ · mol−1
- ^ S°, 115.1 J · K−1 · mol−1
- ^ Cp°, 117.57 J · K−1 · mol−1
- ^ ΔfH°, -1466.24 kJ · mol−1
- ^ ΔfG°, -1331.20 kJ · mol−1
- ^ S°, 47.3 J · K−1 · mol−1
- ^ Cp°, -155.6 J · K−1 · mol−1
- ^ ΔfH°, -1735.5 kJ · mol−1
- ^ ΔfG°, -1565.5 kJ · mol−1
- ^ S°, 163.6 J · K−1 · mol−1
- ^ Cp°, 151.08 J · K−1 · mol−1
- ^ ΔfH°, -597.94 kJ · mol−1
- ^ ΔfG°, -561.18 kJ · mol−1
- ^ S°, 37.57 J · K−1 · mol−1
- ^ Cp°, 54.10 J · K−1 · mol−1
- ^ ΔfH°, -160.7 kJ · mol−1
- ^ ΔfG°, -181.6 kJ · mol−1
- ^ S°, 231.48 J · K−1 · mol−1
- ^ Cp°, 49.83 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 31.80 J · K−1 · mol−1
- ^ Cp°, 22.64 J · K−1 · mol−1
- ^ ΔfH°, 0.33 kJ · mol−1
- ^ ΔfH°, 278.805 kJ · mol−1
- ^ ΔfG°, 238.250 kJ · mol−1
- ^ S°, 167.821 J · K−1 · mol−1
- ^ Cp°, 23.673 J · K−1 · mol−1