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4LiI + O2 🔥→ 2Li2O + 2I2

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Reaction of lithium iodide and oxygen
4LiILithium iodide + O2Oxygen
🔥
⟶
2Li2OLithium oxide + 2I2Iodine

The reaction of lithium iodide and oxygen yields lithium oxide and iodine. This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related categories

Reaction data

Chemical equation

Reaction of lithium iodide and oxygen
4LiILithium iodide + O2Oxygen
🔥
⟶
2Li2OLithium oxide + 2I2Iodine

General equation

Reaction of oxidizable species and oxidizing species
Oxidizable speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of lithium iodide and oxygen

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
LiILithium iodide4
Reducing
Oxidizable
O2Oxygen1
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Li2OLithium oxide2
Reduced
–
I2Iodine2
Oxidized
–

Thermodynamic changes

Changes in standard condition

Reaction of lithium iodide and oxygen
◆
ΔrG−41.20 kJ/mol
K1.65 × 107
pK−7.22
4LiICrystalline solid + O2Gas
🔥
⟶
2Li2OCrystalline solid + 2I2Crystalline solid
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
−114.24−41.20−244.85−16.44
per 1 mol of
−28.560−10.30−61.212−4.110
per 1 mol of
−114.24−41.20−244.85−16.44
per 1 mol of
−57.120−20.60−122.42−8.220
per 1 mol of
−57.120−20.60−122.42−8.220

Changes in aqueous solution

Reaction of lithium iodide and oxygen
◆
ΔrG273.2 kJ/mol
K0.14 × 10−47
pK47.86
4LiIIonized aqueous solution + O2Un-ionized aqueous solution
🔥
⟶
2Li2OCrystalline solid + 2I2Un-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
195.7273.2−260.2–
per 1 mol of
48.9268.30−65.05–
per 1 mol of
195.7273.2−260.2–
per 1 mol of
97.85136.6−130.1–
per 1 mol of
97.85136.6−130.1–

Thermodynamic data of reactants

Chemical formulaStandard 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
LiI (cr)-270.41[1]-270.29[1]86.78[1]51.04[1]
LiI (g)-81.09[1]-124.34[1]232.321[1]34.64[1]
LiI (ai)-333.67[1]-344.8[1]124.7[1]-73.6[1]
LiI (cr)
1 hydrate
-590.32[1]-531.3[1]123.0[1]–
LiI (cr)
2 hydrate
-890.40[1]-780.2[1]184[1]–
LiI (cr)
3 hydrate
-1192.15[1]-1032.13[1]250.2[1]–
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]–
* (cr):Crystalline solid, (g):Gas, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard 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
Li2O (cr)-597.94[1]-561.18[1]37.57[1]54.10[1]
Li2O (g)-160.7[1]-181.6[1]231.48[1]49.83[1]
I2 (cr)0[1]0[1]116.135[1]54.438[1]
I2 (g)62.438[1]19.327[1]260.69[1]36.90[1]
I2 (ao)22.6[1]16.40[1]137.2[1]–
* (cr):Crystalline solid, (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)