6(NH4)3AsO4 🔥→ N2O3↑ + 6H3AsO3 + 3H2O + 16NH3↑
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- Decomposition of ammonium arsenate
Decomposition of ammonium arsenate yields dinitrogen trioxide, arsenous acid, water, and ammonia (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 ammonium 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 ammonium arsenate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| (NH4)3AsO4 | Ammonium arsenate | 6 | Self redox agent | Thermally decomposable Oxoacid salt |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| N2O3 | Dinitrogen trioxide | 1 | Oxidized | – |
| H3AsO3 | Arsenous acid | 6 | Reduced | – |
| H2O | Water | 3 | – | – |
| NH3 | Ammonia | 16 | – | – |
Thermodynamic changes
Changes in standard condition (1)
- Decomposition of ammonium arsenate◆
ΔrG 643.99 kJ/mol K 0.15 × 10−112 pK 112.82 - 6(NH4)3AsO4Ionized aqueous solutionN2O3↑Gas + 6H3AsO3Un-ionized aqueous solution + 3H2OLiquid + 16NH3↑Gas🔥⟶
| 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 | 1749.2 | 643.99 | 3706.8 | – |
per 1 mol of | 291.53 | 107.33 | 617.80 | – |
per 1 mol of | 1749.2 | 643.99 | 3706.8 | – |
per 1 mol of | 291.53 | 107.33 | 617.80 | – |
per 1 mol of | 583.07 | 214.66 | 1235.6 | – |
per 1 mol of | 109.33 | 40.249 | 231.68 | – |
Changes in standard condition (2)
- Decomposition of ammonium arsenate◆
ΔrG 483.19 kJ/mol K 0.22 × 10−84 pK 84.65 - 6(NH4)3AsO4Ionized aqueous solutionN2O3↑Gas + 6H3AsO3Un-ionized aqueous solution + 3H2OLiquid + 16NH3↑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 | 1202.4 | 483.19 | 2408.4 | – |
per 1 mol of | 200.40 | 80.532 | 401.40 | – |
per 1 mol of | 1202.4 | 483.19 | 2408.4 | – |
per 1 mol of | 200.40 | 80.532 | 401.40 | – |
per 1 mol of | 400.80 | 161.06 | 802.80 | – |
per 1 mol of | 75.150 | 30.199 | 150.53 | – |
Changes in standard condition (3)
- Decomposition of ammonium 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 | 1749.2 | – | – | – |
per 1 mol of | 291.53 | – | – | – |
per 1 mol of | 1749.2 | – | – | – |
per 1 mol of | 291.53 | – | – | – |
per 1 mol of | 583.07 | – | – | – |
per 1 mol of | 109.33 | – | – | – |
Changes in standard condition (4)
- Decomposition of ammonium arsenate
- 6(NH4)3AsO4Ionized aqueous solutionN2O3↑Gas + 6H3AsO3Aqueous solution + 3H2OLiquid + 16NH3↑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 | 1202.4 | – | – | – |
per 1 mol of | 200.40 | – | – | – |
per 1 mol of | 1202.4 | – | – | – |
per 1 mol of | 200.40 | – | – | – |
per 1 mol of | 400.80 | – | – | – |
per 1 mol of | 75.150 | – | – | – |
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 |
|---|---|---|---|---|
| (NH4)3AsO4 (cr) | -1286.2[1] | – | – | – |
| (NH4)3AsO4 (ai) | -1285.66[1] | -886.32[1] | 177.4[1] | – |
| (NH4)3AsO4 (cr) 3 hydrate | -2166.9[1] | – | – | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution
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 |
|---|---|---|---|---|
| N2O3 (l) | 50.29[1] | – | – | – |
| N2O3 (g) | 83.72[1] | 139.46[1] | 312.28[1] | 65.61[1] |
| H3AsO3 (ao) | -742.2[1] | -639.80[1] | 195.0[1] | – |
| H3AsO3 (aq) | -742.2[1] | – | – | – |
| H2O (cr) | – | – | – | – |
| H2O (l) | -285.830[1] | -237.129[1] | 69.91[1] | 75.291[1] |
| H2O (g) | -241.818[1] | -228.572[1] | 188.825[1] | 33.577[1] |
| NH3 (g) | -46.11[1] | -16.45[1] | 192.45[1] | 35.06[1] |
| NH3 (ao) | -80.29[1] | -26.50[1] | 111.3[1] | – |
* (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution, (aq):Aqueous solution, (cr):Crystalline solid
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°, -1286.2 kJ · mol−1
- ^ ΔfH°, -1285.66 kJ · mol−1
- ^ ΔfG°, -886.32 kJ · mol−1
- ^ S°, 177.4 J · K−1 · mol−1
- ^ ΔfH°, -2166.9 kJ · mol−1
- ^ ΔfH°, 50.29 kJ · mol−1
- ^ ΔfH°, 83.72 kJ · mol−1
- ^ ΔfG°, 139.46 kJ · mol−1
- ^ S°, 312.28 J · K−1 · mol−1
- ^ Cp°, 65.61 J · K−1 · mol−1
- ^ ΔfH°, -742.2 kJ · mol−1
- ^ ΔfG°, -639.80 kJ · mol−1
- ^ S°, 195.0 J · K−1 · mol−1
- ^ ΔfH°, -742.2 kJ · mol−1
- ^ ΔfH°, -285.830 kJ · mol−1
- ^ ΔfG°, -237.129 kJ · mol−1
- ^ S°, 69.91 J · K−1 · mol−1
- ^ Cp°, 75.291 J · K−1 · mol−1
- ^ ΔfH°, -241.818 kJ · mol−1
- ^ ΔfG°, -228.572 kJ · mol−1
- ^ S°, 188.825 J · K−1 · mol−1
- ^ Cp°, 33.577 J · K−1 · mol−1
- ^ ΔfH°, -46.11 kJ · mol−1
- ^ ΔfG°, -16.45 kJ · mol−1
- ^ S°, 192.45 J · K−1 · mol−1
- ^ Cp°, 35.06 J · K−1 · mol−1
- ^ ΔfH°, -80.29 kJ · mol−1
- ^ ΔfG°, -26.50 kJ · mol−1
- ^ S°, 111.3 J · K−1 · mol−1