Zn3(AsO4)2 🔥→ 3Zn + As2O5 + O3↑
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- Decomposition of zinc arsenate
Decomposition of zinc arsenate yields , diarsenic pentaoxide, 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 zinc arsenate
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 zinc arsenate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| Zn3(AsO4)2 | Zinc arsenate | 1 | Self redox agent | Thermally decomposable Oxoacid salt |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| 3 | Reduced | – | ||
| As2O5 | Diarsenic pentaoxide | 1 | – | – |
| 1 | Oxidized | – |
Thermodynamic changes
Changes in standard condition
- Decomposition of zinc arsenate◆
ΔrG 1276 kJ/mol K 0.28 × 10−223 pK 223.55
| 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 | – | 1276 | – | – |
per 1 mol of | – | 1276 | – | – |
| – | 425.3 | – | – | |
per 1 mol of | – | 1276 | – | – |
| – | 1276 | – | – |
Changes in aqueous solution (1)
- Decomposition of zinc arsenate
| 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 | – | – | – | – |
per 1 mol of | – | – | – | – |
| – | – | – | – | |
per 1 mol of | – | – | – | – |
| – | – | – | – |
Changes in aqueous solution (2)
- Decomposition of zinc arsenate
- Zn3(AsO4)2Crystalline solid3Crystalline solid + As2O5Aqueous solution + ↑Un-ionized aqueous solution🔥⟶
| 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 | – | – | – | – |
per 1 mol of | – | – | – | – |
| – | – | – | – | |
per 1 mol of | – | – | – | – |
| – | – | – | – |
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 |
|---|---|---|---|---|
| Zn3(AsO4)2 (cr) | – | -1895[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 |
|---|---|---|---|---|
| (cr) | 0[1] | 0[1] | 41.63[1] | 25.40[1] |
| (g) | 130.729[1] | 95.145[1] | 160.984[1] | 20.786[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] | – | – | – |
| (g) | 142.7[1] | 163.2[1] | 238.93[1] | 39.20[1] |
| (ao) | 125.9[1] | 174.1[1] | 146[1] | – |
* (cr):Crystalline solid, (g):Gas, (aq):Aqueous solution, (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°, -1895. kJ · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 41.63 J · K−1 · mol−1
- ^ Cp°, 25.40 J · K−1 · mol−1
- ^ ΔfH°, 130.729 kJ · mol−1
- ^ ΔfG°, 95.145 kJ · mol−1
- ^ S°, 160.984 J · K−1 · mol−1
- ^ Cp°, 20.786 J · K−1 · mol−1
- ^ ΔfH°, -924.87 kJ · mol−1
- ^ ΔfG°, -782.3 kJ · mol−1
- ^ S°, 105.4 J · K−1 · mol−1
- ^ Cp°, 116.52 J · K−1 · mol−1
- ^ ΔfH°, -951.4 kJ · mol−1
- ^ ΔfH°, -2104.6 kJ · mol−1
- ^ ΔfH°, 142.7 kJ · mol−1
- ^ ΔfG°, 163.2 kJ · mol−1
- ^ S°, 238.93 J · K−1 · mol−1
- ^ Cp°, 39.20 J · K−1 · mol−1
- ^ ΔfH°, 125.9 kJ · mol−1
- ^ ΔfG°, 174.1 kJ · mol−1
- ^ S°, 146. J · K−1 · mol−1