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4(NH4)2S2O3 ๐Ÿ”ฅโ†’ 3(NH4)2SO4 + 2NH3โ†‘ + 5S + H2โ†‘

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Decomposition of ammonium thiosulfate
4(NH4)2S2O3Ammonium thiosulfate
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ammonium sulfate + 2NH3โ†‘Ammonia + 5SSulfur + H2โ†‘Hydrogen

Decomposition of ammonium thiosulfate yields ammonium sulfate, ammonia, sulfur, and hydrogen (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 thiosulfate
4(NH4)2S2O3Ammonium thiosulfate
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ammonium sulfate + 2NH3โ†‘Ammonia + 5SSulfur + H2โ†‘Hydrogen

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 thiosulfate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2S2O3Ammonium thiosulfate4
Oxidizing
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2SO4Ammonium sulfate3
Oxidized
โ€“
NH3Ammonia2
โ€“
โ€“
SSulfur5
Redoxed product
โ€“
H2Hydrogen1
Reduced
โ€“

Thermodynamic changes

Changes in aqueous solution (1)

Decomposition of ammonium thiosulfate
4(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ionized aqueous solution + 2NH3โ†‘Gas + 5SCrystalline solidrhombic + H2โ†‘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
53.3โ€“โ€“โ€“
13.3โ€“โ€“โ€“
per 1 mol of
17.8โ€“โ€“โ€“
per 1 mol of
26.6โ€“โ€“โ€“
per 1 mol of
10.7โ€“โ€“โ€“
per 1 mol of
53.3โ€“โ€“โ€“

Changes in aqueous solution (2)

Decomposition of ammonium thiosulfate
4(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ionized aqueous solution + 2NH3โ†‘Gas + 5SCrystalline solidrhombic + H2โ†‘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
49.1โ€“โ€“โ€“
12.3โ€“โ€“โ€“
per 1 mol of
16.4โ€“โ€“โ€“
per 1 mol of
24.6โ€“โ€“โ€“
per 1 mol of
9.82โ€“โ€“โ€“
per 1 mol of
49.1โ€“โ€“โ€“

Changes in aqueous solution (3)

Decomposition of ammonium thiosulfate
4(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ionized aqueous solution + 2NH3โ†‘Un-ionized aqueous solution + 5SCrystalline solidrhombic + H2โ†‘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
โˆ’15.0โ€“โ€“โ€“
โˆ’3.75โ€“โ€“โ€“
per 1 mol of
โˆ’5.00โ€“โ€“โ€“
per 1 mol of
โˆ’7.50โ€“โ€“โ€“
per 1 mol of
โˆ’3.00โ€“โ€“โ€“
per 1 mol of
โˆ’15.0โ€“โ€“โ€“

Changes in aqueous solution (4)

Decomposition of ammonium thiosulfate
4(NH4)2S2O3Aqueous solution
๐Ÿ”ฅ
โŸถ
3(NH4)2SO4Ionized aqueous solution + 2NH3โ†‘Un-ionized aqueous solution + 5SCrystalline solidrhombic + H2โ†‘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
โˆ’19.2โ€“โ€“โ€“
โˆ’4.80โ€“โ€“โ€“
per 1 mol of
โˆ’6.40โ€“โ€“โ€“
per 1 mol of
โˆ’9.60โ€“โ€“โ€“
per 1 mol of
โˆ’3.84โ€“โ€“โ€“
per 1 mol of
โˆ’19.2โ€“โ€“โ€“

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)2S2O3 (aq)-917.1[1]โ€“โ€“โ€“
* (aq):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
(NH4)2SO4 (cr)-1180.85[1]-901.67[1]220.1[1]187.49[1]
(NH4)2SO4 (ai)-1174.28[1]-903.14[1]246.9[1]-133.1[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€“
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]โ€“โ€“โ€“
S (g)278.805[1]238.250[1]167.821[1]23.673[1]
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]โ€“
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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)