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4FeAsO4 🔥→ 4Fe + 2As2O3 + 5O2

Decomposition of iron(III) arsenate yields iron, diarsenic trioxide, 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 iron(III) arsenate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
FeAsO4Iron(III) arsenate4
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
FeIron4
Reduced
As2O3Diarsenic trioxide2
Reduced
O2Oxygen5
Oxidized

Thermodynamic changes

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
FeAsO4

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
Fe (cr)0[1]0[1]27.28[1]25.10[1]
Fe (g)416.3[1]370.7[1]180.490[1]25.677[1]
As2O3 (cr)
octahedral
-656.97[1]-576.22[1]107.1[1]95.65[1]
As2O3 (cr)
monoclinic
-654.8[1]-576.97[1]117[1]
As2O3 (g)-604.6[1]-548.9[1]191[1]
As2O3 (aq)-626.8[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, (aq):Aqueous solution, (ao):Un-ionized aqueous solution

References

List of references

  1. 1