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6(NH4)2SO3 ๐Ÿ”ฅโ†’ N2O3โ†‘ + 3(NH4)2S2O3 + 6H2O + 4NH3โ†‘

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Decomposition of ammonium sulfite
6(NH4)2SO3Ammonium sulfite
๐Ÿ”ฅ
โŸถ
N2O3โ†‘Dinitrogen trioxide + 3(NH4)2S2O3Ammonium thiosulfate + 6H2OWater + 4NH3โ†‘Ammonia

Decomposition of ammonium sulfite yields dinitrogen trioxide, ammonium thiosulfate, 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 sulfite
6(NH4)2SO3Ammonium sulfite
๐Ÿ”ฅ
โŸถ
N2O3โ†‘Dinitrogen trioxide + 3(NH4)2S2O3Ammonium thiosulfate + 6H2OWater + 4NH3โ†‘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 sulfite

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2SO3Ammonium sulfite6
Reducing
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
N2O3Dinitrogen trioxide1
Oxidized
โ€“
(NH4)2S2O3Ammonium thiosulfate3
Redoxed product
โ€“
H2OWater6
โ€“
โ€“
NH3Ammonia4
โ€“
โ€“

Thermodynamic changes

Changes in aqueous solution (1)

Decomposition of ammonium sulfite
6(NH4)2SO3Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
N2O3โ†‘Gas + 3(NH4)2S2O3Aqueous solution + 6H2OLiquid + 4NH3โ†‘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
835.4โ€“โ€“โ€“
per 1 mol of
139.2โ€“โ€“โ€“
835.4โ€“โ€“โ€“
278.5โ€“โ€“โ€“
per 1 mol of
139.2โ€“โ€“โ€“
per 1 mol of
208.8โ€“โ€“โ€“

Changes in aqueous solution (2)

Decomposition of ammonium sulfite
6(NH4)2SO3Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
N2O3โ†‘Gas + 3(NH4)2S2O3Aqueous solution + 6H2OLiquid + 4NH3โ†‘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
698.7โ€“โ€“โ€“
per 1 mol of
116.5โ€“โ€“โ€“
698.7โ€“โ€“โ€“
232.9โ€“โ€“โ€“
per 1 mol of
116.5โ€“โ€“โ€“
per 1 mol of
174.7โ€“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)2SO3 (cr)-885.3[1]โ€“โ€“โ€“
(NH4)2SO3 (ai)-900.4[1]-645.0[1]197.5[1]โ€“
(NH4)2SO3 (cr)
1 hydrate
-1187.4[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
N2O3 (l)50.29[1]โ€“โ€“โ€“
N2O3 (g)83.72[1]139.46[1]312.28[1]65.61[1]
(NH4)2S2O3 (aq)-917.1[1]โ€“โ€“โ€“
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€“
* (l):Liquid, (g):Gas, (aq):Aqueous solution, (cr):Crystalline solid, (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)