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4S + 6NH3 + 3H2O → (NH4)2S2O3 + 2(NH4)2S

The reaction of sulfur, ammonia, and water yields ammonium thiosulfate and ammonium sulfide (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 nonmetal and base in aqueous solution
NonmetalSelf redox agent + BaseNon-redox agent + H2ONon-redox agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of sulfur, ammonia, and water

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
SSulfur4
Nonmetal
NH3Ammonia6
Base
H2OWater3
Water

Products

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2S2O3Ammonium thiosulfate1
Redoxed product
(NH4)2SAmmonium sulfide2
Reduced

Thermodynamic changes

Changes in aqueous solution

Reaction of sulfur, ammonia, and water
4SCrystalline solidrhombic + 6NH3Un-ionized aqueous solution + 3H2OLiquid
(NH4)2S2O3Aqueous solution + 2(NH4)2SIonized aqueous solution
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−41.5
per 1 mol of
−10.4
per 1 mol of
−6.92
per 1 mol of
−13.8
−41.5
per 1 mol of
−20.8

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
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]
S (g)278.805[1]238.250[1]167.821[1]23.673[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]
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, (g):Gas, (ao):Un-ionized aqueous solution, (l):Liquid

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
(NH4)2S2O3 (aq)-917.1[1]
(NH4)2S (ai)-231.8[1]-72.6[1]212.1[1]
* (aq):Aqueous solution, (ai):Ionized aqueous solution

References

List of references

  1. 1