4HCN + 7O2 → 4NO + 4CO2 + 2H2O
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- Reaction of hydrogen cyanide and
The reaction of hydrogen cyanide and yields nitrogen monoxide, carbon 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 cyanide and
General equation
- Reaction of reducing species and oxidizing species
- Reducing speciesReducing agent + Oxidizing speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of hydrogen cyanide and
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| HCN | Hydrogen cyanide | 4 | Reducing | Reducing |
| 7 | Oxidizing | Oxidizing |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| NO | Nitrogen monoxide | 4 | Redoxed product | – |
| CO2 | Carbon dioxide | 4 | Redoxed product | – |
| H2O | Water | 2 | Reduced | – |
Thermodynamic changes
Changes in standard condition
- Reaction of hydrogen cyanide and ◆
ΔrG −2205.37 kJ/mol K 2.31 × 10386 pK −386.36
| 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 | −2220.18 | −2205.37 | −49.50 | −69.61 |
per 1 mol of | −555.045 | −551.342 | −12.38 | −17.40 |
| −317.169 | −315.053 | −7.071 | −9.944 | |
per 1 mol of | −555.045 | −551.342 | −12.38 | −17.40 |
per 1 mol of | −555.045 | −551.342 | −12.38 | −17.40 |
per 1 mol of | −1110.09 | −1102.68 | −24.75 | −34.80 |
Changes in aqueous solution (1)
- Reaction of hydrogen cyanide and ◆
ΔrG −2509.9 kJ/mol K 5.19 × 10439 pK −439.72
| 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 | −2305.2 | −2509.9 | 685.1 | – |
per 1 mol of | −576.30 | −627.48 | 171.3 | – |
| −329.31 | −358.56 | 97.87 | – | |
per 1 mol of | −576.30 | −627.48 | 171.3 | – |
per 1 mol of | −576.30 | −627.48 | 171.3 | – |
per 1 mol of | −1152.6 | −1255.0 | 342.6 | – |
Changes in aqueous solution (2)
- Reaction of hydrogen cyanide and ◆
ΔrG −2476.4 kJ/mol K 7.02 × 10433 pK −433.85
| 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 | −2386.4 | −2476.4 | 300.6 | – |
per 1 mol of | −596.60 | −619.10 | 75.15 | – |
| −340.91 | −353.77 | 42.94 | – | |
per 1 mol of | −596.60 | −619.10 | 75.15 | – |
per 1 mol of | −596.60 | −619.10 | 75.15 | – |
per 1 mol of | −1193.2 | −1238.2 | 150.3 | – |
Changes in aqueous solution (3)
- Reaction of hydrogen cyanide and ◆
ΔrG −2299.1 kJ/mol K 6.09 × 10402 pK −402.78
| 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 | −2131.2 | −2299.1 | 562.7 | – |
per 1 mol of | −532.80 | −574.77 | 140.7 | – |
| −304.46 | −328.44 | 80.39 | – | |
per 1 mol of | −532.80 | −574.77 | 140.7 | – |
per 1 mol of | −532.80 | −574.77 | 140.7 | – |
per 1 mol of | −1065.6 | −1149.5 | 281.4 | – |
Changes in aqueous solution (4)
- Reaction of hydrogen cyanide and ◆
ΔrG −2265.6 kJ/mol K 8.24 × 10396 pK −396.92
| 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 | −2212.4 | −2265.6 | 178.2 | – |
per 1 mol of | −553.10 | −566.40 | 44.55 | – |
| −316.06 | −323.66 | 25.46 | – | |
per 1 mol of | −553.10 | −566.40 | 44.55 | – |
per 1 mol of | −553.10 | −566.40 | 44.55 | – |
per 1 mol of | −1106.2 | −1132.8 | 89.10 | – |
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 |
|---|---|---|---|---|
| HCN (l) | 108.87[1] | 124.97[1] | 112.84[1] | 70.63[1] |
| HCN (g) | 135.1[1] | 124.7[1] | 201.78[1] | 35.86[1] |
| HCN (ai) | 150.6[1] | 172.4[1] | 94.1[1] | – |
| HCN (ao) | 107.1[1] | 119.7[1] | 124.7[1] | – |
| (g) | 0[1] | 0[1] | 205.138[1] | 29.355[1] |
| (ao) | -11.7[1] | 16.4[1] | 110.9[1] | – |
* (l):Liquid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-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] |
| CO2 (g) | -393.509[1] | -394.359[1] | 213.74[1] | 37.11[1] |
| CO2 (ao) | -413.80[1] | -385.98[1] | 117.6[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] |
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (l):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°, 108.87 kJ · mol−1
- ^ ΔfG°, 124.97 kJ · mol−1
- ^ S°, 112.84 J · K−1 · mol−1
- ^ Cp°, 70.63 J · K−1 · mol−1
- ^ ΔfH°, 135.1 kJ · mol−1
- ^ ΔfG°, 124.7 kJ · mol−1
- ^ S°, 201.78 J · K−1 · mol−1
- ^ Cp°, 35.86 J · K−1 · mol−1
- ^ ΔfH°, 150.6 kJ · mol−1
- ^ ΔfG°, 172.4 kJ · mol−1
- ^ S°, 94.1 J · K−1 · mol−1
- ^ ΔfH°, 107.1 kJ · mol−1
- ^ ΔfG°, 119.7 kJ · mol−1
- ^ S°, 124.7 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 205.138 J · K−1 · mol−1
- ^ Cp°, 29.355 J · K−1 · mol−1
- ^ ΔfH°, -11.7 kJ · mol−1
- ^ ΔfG°, 16.4 kJ · mol−1
- ^ S°, 110.9 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°, -393.509 kJ · mol−1
- ^ ΔfG°, -394.359 kJ · mol−1
- ^ S°, 213.74 J · K−1 · mol−1
- ^ Cp°, 37.11 J · K−1 · mol−1
- ^ ΔfH°, -413.80 kJ · mol−1
- ^ ΔfG°, -385.98 kJ · mol−1
- ^ S°, 117.6 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