2H2S + 3SeO2 → 2SO2 + 3Se + 2H2O
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- Reaction of hydrogen sulfide and selenium dioxide
The reaction of hydrogen sulfide and selenium dioxide yields sulfur dioxide, , and water (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of hydrogen sulfide and selenium dioxide
General equation
- Reaction of reducing species and reducible species
- Reducing speciesReducing agent + Reducible speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of hydrogen sulfide and selenium dioxide
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| H2S | Hydrogen sulfide | 2 | Reducing | Reducing |
| SeO2 | Selenium dioxide | 3 | Oxidizing | Reducible |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| SO2 | Sulfur dioxide | 2 | Oxidized | – |
| 3 | Reduced | – | ||
| H2O | Water | 2 | – | – |
Thermodynamic changes
Changes in standard condition (1)
- Reaction of hydrogen sulfide and selenium dioxide
| 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 | −448.01 | – | – | – |
per 1 mol of | −224.00 | – | – | – |
per 1 mol of | −149.34 | – | – | – |
per 1 mol of | −224.00 | – | – | – |
| −149.34 | – | – | – | |
per 1 mol of | −224.00 | – | – | – |
Changes in standard condition (2)
- Reaction of hydrogen sulfide and selenium dioxide
| 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 | −427.9 | – | – | – |
per 1 mol of | −213.9 | – | – | – |
per 1 mol of | −142.6 | – | – | – |
per 1 mol of | −213.9 | – | – | – |
| −142.6 | – | – | – | |
per 1 mol of | −213.9 | – | – | – |
Changes in aqueous solution (1)
- Reaction of hydrogen sulfide and selenium dioxide
| 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 | −421.0 | – | – | – |
per 1 mol of | −210.5 | – | – | – |
per 1 mol of | −140.3 | – | – | – |
per 1 mol of | −210.5 | – | – | – |
| −140.3 | – | – | – | |
per 1 mol of | −210.5 | – | – | – |
Changes in aqueous solution (2)
- Reaction of hydrogen sulfide and selenium dioxide
| 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 | −473.3 | – | – | – |
per 1 mol of | −236.7 | – | – | – |
per 1 mol of | −157.8 | – | – | – |
per 1 mol of | −236.7 | – | – | – |
| −157.8 | – | – | – | |
per 1 mol of | −236.7 | – | – | – |
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 |
|---|---|---|---|---|
| H2S (g) | -20.63[1] | -33.56[1] | 205.79[1] | 34.23[1] |
| H2S (ao) | -39.7[1] | -27.83[1] | 121[1] | – |
| SeO2 (cr) | -225.35[1] | – | – | – |
| SeO2 (aq) | -221.63[1] | – | – | – |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (aq):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 |
|---|---|---|---|---|
| SO2 (l) | -320.5[1] | – | – | – |
| SO2 (g) | -296.830[1] | -300.194[1] | 248.22[1] | 39.87[1] |
| SO2 (ao) | -322.980[1] | -300.676[1] | 161.9[1] | – |
| (cr) hexagonal, gray | 0[1] | 0[1] | 42.442[1] | 25.363[1] |
| (cr) monoclinic, red | 6.7[1] | – | – | – |
| (vit) | 5.0[1] | – | – | – |
| (g) | 227.07[1] | 187.03[1] | 176.72[1] | 20.820[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] |
* (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (vit):Vitreous liquid
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°, -20.63 kJ · mol−1
- ^ ΔfG°, -33.56 kJ · mol−1
- ^ S°, 205.79 J · K−1 · mol−1
- ^ Cp°, 34.23 J · K−1 · mol−1
- ^ ΔfH°, -39.7 kJ · mol−1
- ^ ΔfG°, -27.83 kJ · mol−1
- ^ S°, 121. J · K−1 · mol−1
- ^ ΔfH°, -225.35 kJ · mol−1
- ^ ΔfH°, -221.63 kJ · mol−1
- ^ ΔfH°, -320.5 kJ · mol−1
- ^ ΔfH°, -296.830 kJ · mol−1
- ^ ΔfG°, -300.194 kJ · mol−1
- ^ S°, 248.22 J · K−1 · mol−1
- ^ Cp°, 39.87 J · K−1 · mol−1
- ^ ΔfH°, -322.980 kJ · mol−1
- ^ ΔfG°, -300.676 kJ · mol−1
- ^ S°, 161.9 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 42.442 J · K−1 · mol−1
- ^ Cp°, 25.363 J · K−1 · mol−1
- ^ ΔfH°, 6.7 kJ · mol−1
- ^ ΔfH°, 5.0 kJ · mol−1
- ^ ΔfH°, 227.07 kJ · mol−1
- ^ ΔfG°, 187.03 kJ · mol−1
- ^ S°, 176.72 J · K−1 · mol−1
- ^ Cp°, 20.820 J · K−1 · 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