2ZnBr2 + O2 🔥→ 2ZnO + 2Br2
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- Reaction of zinc bromide and
The reaction of zinc bromide and yields zinc oxide and . This reaction is an oxidation-reduction reaction and is classified as follows:
Table of contents
Reaction data
Chemical equation
- Reaction of zinc bromide and
General equation
- Reaction of hardly oxidizable species and oxidizing species
- Hardly oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent ⟶ ProductOxidation product + ProductReduction product
Oxidation state of each atom
- Reaction of zinc bromide and
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| ZnBr2 | Zinc bromide | 2 | Reducing | Hardly oxidizable |
| 1 | Oxidizing | Oxidizing |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| ZnO | Zinc oxide | 2 | Reduced | – |
| 2 | Oxidized | – |
Thermodynamic changes
Changes in standard condition
- Reaction of zinc bromide and ◆
ΔrG −12.34 kJ/mol K 1.45 × 102 pK −2.16
| 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 | −39.26 | −12.34 | −90.4 | – |
per 1 mol of | −19.63 | −6.170 | −45.2 | – |
| −39.26 | −12.34 | −90.4 | – | |
per 1 mol of | −19.63 | −6.170 | −45.2 | – |
| −19.63 | −6.170 | −45.2 | – |
Changes in aqueous solution (1)
- Reaction of zinc bromide and ◆
ΔrG 64.8 kJ/mol K 0.44 × 10−11 pK 11.35
| 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 | 103.9 | 64.8 | 132.0 | – |
per 1 mol of | 51.95 | 32.4 | 66.00 | – |
| 103.9 | 64.8 | 132.0 | – | |
per 1 mol of | 51.95 | 32.4 | 66.00 | – |
| 51.95 | 32.4 | 66.00 | – |
Changes in aqueous solution (2)
- Reaction of zinc bromide and ◆
ΔrG 53.7 kJ/mol K 0.39 × 10−9 pK 9.41
| 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 | – | 53.7 | – | – |
per 1 mol of | – | 26.9 | – | – |
| – | 53.7 | – | – | |
per 1 mol of | – | 26.9 | – | – |
| – | 26.9 | – | – |
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 |
|---|---|---|---|---|
| ZnBr2 (cr) | -328.65[1] | -312.13[1] | 138.5[1] | – |
| ZnBr2 (ai) | -396.98[1] | -354.97[1] | 52.7[1] | -238[1] |
| ZnBr2 (ao) | – | -349.4[1] | – | – |
| ZnBr2 (cr) 2 hydrate | -937.2[1] | -799.5[1] | 198.7[1] | – |
| (g) | 0[1] | 0[1] | 205.138[1] | 29.355[1] |
| (ao) | -11.7[1] | 16.4[1] | 110.9[1] | – |
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (g):Gas
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 |
|---|---|---|---|---|
| ZnO (cr) | -348.28[1] | -318.30[1] | 43.64[1] | 40.25[1] |
| (cr) | – | – | – | – |
| (l) | 0[1] | 0[1] | 152.231[1] | 75.689[1] |
| (g) | 30.907[1] | 3.110[1] | 245.463[1] | 36.02[1] |
| (ao) | -2.59[1] | 3.93[1] | 130.5[1] | – |
* (cr):Crystalline solid, (l):Liquid, (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°, -328.65 kJ · mol−1
- ^ ΔfG°, -312.13 kJ · mol−1
- ^ S°, 138.5 J · K−1 · mol−1
- ^ ΔfH°, -396.98 kJ · mol−1
- ^ ΔfG°, -354.97 kJ · mol−1
- ^ S°, 52.7 J · K−1 · mol−1
- ^ Cp°, -238. J · K−1 · mol−1
- ^ ΔfG°, -349.4 kJ · mol−1
- ^ ΔfH°, -937.2 kJ · mol−1
- ^ ΔfG°, -799.5 kJ · mol−1
- ^ S°, 198.7 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°, -348.28 kJ · mol−1
- ^ ΔfG°, -318.30 kJ · mol−1
- ^ S°, 43.64 J · K−1 · mol−1
- ^ Cp°, 40.25 J · K−1 · mol−1
- ^ ΔfH°, 0 kJ · mol−1
- ^ ΔfG°, 0 kJ · mol−1
- ^ S°, 152.231 J · K−1 · mol−1
- ^ Cp°, 75.689 J · K−1 · mol−1
- ^ ΔfH°, 30.907 kJ · mol−1
- ^ ΔfG°, 3.110 kJ · mol−1
- ^ S°, 245.463 J · K−1 · mol−1
- ^ Cp°, 36.02 J · K−1 · mol−1
- ^ ΔfH°, -2.59 kJ · mol−1
- ^ ΔfG°, 3.93 kJ · mol−1
- ^ S°, 130.5 J · K−1 · mol−1