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5As2S3 + 20HNO3 → 3As2S5 + 2As2O5 + 10N2O4 + 10H2O

The reaction of diarsenic trisulfide and nitric acid yields diarsenic pentasulfide, diarsenic pentaoxide, dinitrogen tetraoxide, and water (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

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
As2S3Diarsenic trisulfide5
Reducing
Reducing
HNO3Nitric acid20
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
As2S5Diarsenic pentasulfide3
Oxidized
As2O5Diarsenic pentaoxide2
Oxidized
N2O4Dinitrogen tetraoxide10
Reduced
H2OWater10

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
As2S3 (cr)-169.0[1]-168.6[1]163.6[1]116.3[1]
HNO3 (l)-174.10[1]-80.71[1]155.60[1]109.87[1]
HNO3 (g)-135.06[1]-74.72[1]266.38[1]53.35[1]
HNO3 (ai)-207.36[1]-111.25[1]146.4[1]-86.6[1]
HNO3 (l)
1 hydrate
-473.46[1]-328.77[1]216.90[1]182.46[1]
HNO3 (l)
3 hydrate
-1056.04[1]-811.09[1]346.98[1]325.14[1]
* (cr):Crystalline solid, (l):Liquid, (g):Gas, (ai):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
As2S5
As2O5 (cr)-924.87[1]-782.3[1]105.4[1]116.52[1]
As2O5 (aq)-951.4[1]
As2O5 (cr)
4 hydrate
-2104.6[1]
N2O4 (l)-19.50[1]97.54[1]209.2[1]142.7[1]
N2O4 (g)9.16[1]97.89[1]304.29[1]77.28[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]
* (cr):Crystalline solid, (aq):Aqueous solution, (l):Liquid, (g):Gas

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)