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8(NH4)3AsO4 ๐Ÿ”ฅโ†’ 5NH4NO3 + 8As + 17H2O + 14NH3โ†‘

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Decomposition of ammonium arsenate
8(NH4)3AsO4Ammonium arsenate
๐Ÿ”ฅ
โŸถ
5NH4NO3Ammonium nitrate + 8AsArsenic + 17H2OWater + 14NH3โ†‘Ammonia

Decomposition of ammonium arsenate yields ammonium nitrate, arsenic, water, and ammonia (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

Decomposition of ammonium arsenate
8(NH4)3AsO4Ammonium arsenate
๐Ÿ”ฅ
โŸถ
5NH4NO3Ammonium nitrate + 8AsArsenic + 17H2OWater + 14NH3โ†‘Ammonia

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product
Thermal decomposition of oxoacid salt with redox
Oxoacid saltSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of ammonium arsenate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)3AsO4Ammonium arsenate8
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH4NO3Ammonium nitrate5
Oxidized
โ€“
AsArsenic8
Reduced
โ€“
H2OWater17
โ€“
โ€“
NH3Ammonia14
โ€“
โ€“

Thermodynamic changes

Changes in standard condition (1)

Decomposition of ammonium arsenate
8(NH4)3AsO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5NH4NO3Crystalline solid + 8AsCrystalline solidฮฑ, gray, metallic + 17H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
2957.2โ€“โ€“โ€“
per 1 mol of
369.65โ€“โ€“โ€“
per 1 mol of
591.44โ€“โ€“โ€“
per 1 mol of
369.65โ€“โ€“โ€“
per 1 mol of
173.95โ€“โ€“โ€“
per 1 mol of
211.23โ€“โ€“โ€“

Changes in standard condition (2)

Decomposition of ammonium arsenate
8(NH4)3AsO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5NH4NO3Crystalline solid + 8AsCrystalline solidฮณ, yellow, cubic + 17H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
3074.0โ€“โ€“โ€“
per 1 mol of
384.25โ€“โ€“โ€“
per 1 mol of
614.80โ€“โ€“โ€“
per 1 mol of
384.25โ€“โ€“โ€“
per 1 mol of
180.82โ€“โ€“โ€“
per 1 mol of
219.57โ€“โ€“โ€“

Changes in standard condition (3)

Decomposition of ammonium arsenate
8(NH4)3AsO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5NH4NO3Crystalline solid + 8AsAmorphous solidฮฒ + 17H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
2990.8โ€“โ€“โ€“
per 1 mol of
373.85โ€“โ€“โ€“
per 1 mol of
598.16โ€“โ€“โ€“
per 1 mol of
373.85โ€“โ€“โ€“
per 1 mol of
175.93โ€“โ€“โ€“
per 1 mol of
213.63โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of ammonium arsenate
โ—†
ฮ”rG1876.27 kJ/mol
K0.20 ร— 10โˆ’328
pK328.71
8(NH4)3AsO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
5NH4NO3Ionized aqueous solution + 8AsCrystalline solidฮฑ, gray, metallic + 17H2OLiquid + 14NH3โ†‘Gas
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
3081.281876.274043.4โ€“
per 1 mol of
385.160234.534505.43โ€“
per 1 mol of
616.256375.254808.68โ€“
per 1 mol of
385.160234.534505.43โ€“
per 1 mol of
181.252110.369237.85โ€“
per 1 mol of
220.091134.019288.81โ€“

Changes in aqueous solution (2)

Decomposition of ammonium arsenate
โ—†
ฮ”rG1735.57 kJ/mol
K0.87 ร— 10โˆ’304
pK304.06
8(NH4)3AsO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
5NH4NO3Ionized aqueous solution + 8AsCrystalline solidฮฑ, gray, metallic + 17H2OLiquid + 14NH3โ†‘Un-ionized aqueous solution
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
2602.761735.572907.3โ€“
per 1 mol of
325.345216.946363.41โ€“
per 1 mol of
520.552347.114581.46โ€“
per 1 mol of
325.345216.946363.41โ€“
per 1 mol of
153.104102.092171.02โ€“
per 1 mol of
185.911123.969207.66โ€“

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
(NH4)3AsO4 (cr)-1286.2[1]โ€“โ€“โ€“
(NH4)3AsO4 (ai)-1285.66[1]-886.32[1]177.4[1]โ€“
(NH4)3AsO4 (cr)
3 hydrate
-2166.9[1]โ€“โ€“โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
NH4NO3 (cr)-365.56[1]-183.87[1]151.08[1]139.3[1]
NH4NO3 (ai)-339.87[1]-190.56[1]259.8[1]-6.7[1]
As (cr)
ฮฑ, gray, metallic
0[1]0[1]35.1[1]24.64[1]
As (cr)
ฮณ, yellow, cubic
14.6[1]โ€“โ€“โ€“
As (am)
ฮฒ
4.2[1]โ€“โ€“โ€“
As (g)302.5[1]261.0[1]174.21[1]20.786[1]
H2O (cr)โ€“โ€“โ€“โ€“
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]
NH3 (g)-46.11[1]-16.45[1]192.45[1]35.06[1]
NH3 (ao)-80.29[1]-26.50[1]111.3[1]โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous solid, (g):Gas, (l):Liquid, (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)