10(NH4)2CrO4 → 2NO↑ + 5HCr2O7− + 3OH− + 18NH4+ + 10e−
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- Oxidation of ammonium chromate
- 10(NH4)2CrO4Ammonium chromate2NO↑Nitrogen monoxide + 5HCr2O7−Hydrogendichromate ion + 3OH−Hydroxide ion + 18NH4+Ammonium ion + 10e−Electron⟶
Oxidation of ammonium chromate yields nitrogen monoxide, hydrogendichromate ion, hydroxide ion, ammonium ion. This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Oxidation of ammonium chromate
- 10(NH4)2CrO4Ammonium chromate2NO↑Nitrogen monoxide + 5HCr2O7−Hydrogendichromate ion + 3OH−Hydroxide ion + 18NH4+Ammonium ion + 10e−Electron⟶
General equation
- Oxidation of oxidizable species
- ReactantReducing agent ⟶ ProductOxidation product + e−
Oxidation state of each atom
- Oxidation of ammonium chromate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| (NH4)2CrO4 | Ammonium chromate | 10 | Reducing | – |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| NO | Nitrogen monoxide | 2 | Oxidized | – |
| HCr2O7− | Hydrogendichromate ion | 5 | – | – |
| OH− | Hydroxide ion | 3 | – | – |
| NH4+ | Ammonium ion | 18 | – | – |
| e− | Electron | 10 | – | Electron |
Thermodynamic changes
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)2CrO4 (cr) | -1167.3[1] | – | – | – |
| (NH4)2CrO4 (ai) | -1146.16[1] | -886.36[1] | 277.0[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 |
|---|---|---|---|---|
| NO (g) | 90.25[1] | 86.55[1] | 210.761[1] | 29.844[1] |
| HCr2O7− | – | – | – | – |
| OH− (g) | -143.5[1] | – | – | – |
| OH− (ao) | -229.994[1] | -157.244[1] | -10.75[1] | -148.5[1] |
| NH4+ (ao) | -132.51[1] | -79.31[1] | 113.4[1] | 79.9[1] |
| e− | – | – | – | – |
* (g):Gas, (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)
- ^ ΔfH°, -1167.3 kJ · mol−1
- ^ ΔfH°, -1146.16 kJ · mol−1
- ^ ΔfG°, -886.36 kJ · mol−1
- ^ S°, 277.0 J · K−1 · mol−1
- ^ ΔfH°, 90.25 kJ · mol−1
- ^ ΔfG°, 86.55 kJ · mol−1
- ^ S°, 210.761 J · K−1 · mol−1
- ^ Cp°, 29.844 J · K−1 · mol−1
- ^ ΔfH°, -143.5 kJ · mol−1
- ^ ΔfH°, -229.994 kJ · mol−1
- ^ ΔfG°, -157.244 kJ · mol−1
- ^ S°, -10.75 J · K−1 · mol−1
- ^ Cp°, -148.5 J · K−1 · mol−1
- ^ ΔfH°, -132.51 kJ · mol−1
- ^ ΔfG°, -79.31 kJ · mol−1
- ^ S°, 113.4 J · K−1 · mol−1
- ^ Cp°, 79.9 J · K−1 · mol−1