You-iggy

Li2B4O7 🔥→ Li2O + 4B + 3O2

Decomposition of lithium tetraborate yields lithium oxide, boron, and oxygen (Other reactions are here). 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 reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
🔥
ProductOxidation product + ProductReduction product
Thermal decomposition of oxoacid salt with redox
Oxoacid saltSelf redox agent
🔥
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of lithium tetraborate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
Li2B4O7Lithium tetraborate1
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
Li2OLithium oxide1
BBoron4
Reduced
O2Oxygen3
Oxidized

Thermodynamic changes

Changes in standard condition (1)

Decomposition of lithium tetraborate
Li2B4O7Crystalline solid
🔥
Li2OCrystalline solid + 4BCrystalline solid + 3O2Gas
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
2792.4
2792.4
per 1 mol of
2792.4
per 1 mol of
698.10
per 1 mol of
930.80

Changes in standard condition (2)

Decomposition of lithium tetraborate
Li2B4O7Crystalline solid
🔥
Li2OCrystalline solid + 4BAmorphous solidx denotes undetermined zero point entropy + 3O2Gas
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
2807.6
2807.6
per 1 mol of
2807.6
per 1 mol of
701.90
per 1 mol of
935.87

Changes in aqueous solution (1)

Decomposition of lithium tetraborate
Li2B4O7Crystalline solid
🔥
Li2OCrystalline solid + 4BCrystalline solid + 3O2Gas
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
2792.4
2792.4
per 1 mol of
2792.4
per 1 mol of
698.10
per 1 mol of
930.80

Changes in aqueous solution (2)

Decomposition of lithium tetraborate
Li2B4O7Crystalline solid
🔥
Li2OCrystalline solid + 4BCrystalline solid + 3O2Un-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
2757.3
2757.3
per 1 mol of
2757.3
per 1 mol of
689.33
per 1 mol of
919.10

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
Li2B4O7 (cr)-3390.3[1]
Li2B4O7 (vit)-3342.2[1]
* (cr):Crystalline solid, (vit):Vitreous liquid

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]
B (cr)0[1]0[1]5.86[1]11.09[1]
B (am)
x denotes undetermined zero point entropy
3.8[1]6.53+x[1]11.97[1]
B (g)562.7[1]518.8[1]153.45[1]20.799[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, (am):Amorphous solid, (ao):Un-ionized aqueous solution

References

List of references

  1. 1