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4(NH4)2S + 4MnO2 → 8NH3↑ + MnSO4 + 3MnS + 4H2O

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Reaction of ammonium sulfide and manganese(IV) oxide
4(NH4)2SAmmonium sulfide + 4MnO2Manganese(IV) oxide
⟶
8NH3↑Ammonia + MnSO4Manganese(II) sulfate + 3MnSManganese(II) sulfide + 4H2OWater

The reaction of ammonium sulfide and manganese(IV) oxide yields ammonia, manganese(II) sulfate, manganese(II) sulfide, 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

Reaction of ammonium sulfide and manganese(IV) oxide
4(NH4)2SAmmonium sulfide + 4MnO2Manganese(IV) oxide
⟶
8NH3↑Ammonia + MnSO4Manganese(II) sulfate + 3MnSManganese(II) sulfide + 4H2OWater

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of ammonium sulfide and manganese(IV) oxide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2SAmmonium sulfide4
Reducing
Reducing
MnO2Manganese(IV) oxide4
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH3Ammonia8
–
–
MnSO4Manganese(II) sulfate1
Redoxed product
–
MnSManganese(II) sulfide3
Reduced
–
H2OWater4
–
–

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−570.1 kJ/mol
K7.54 × 1099
pK−99.88
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Gas + MnSO4Un-ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−263.4−570.11029.6–
per 1 mol of
−65.85−142.5257.40–
−65.85−142.5257.40–
per 1 mol of
−32.92−71.26128.70–
−263.4−570.11029.6–
−87.80−190.0343.20–
per 1 mol of
−65.85−142.5257.40–

Changes in aqueous solution (2)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−557.1 kJ/mol
K3.98 × 1097
pK−97.60
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Gas + MnSO4Ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−277.6−557.1939.6–
per 1 mol of
−69.40−139.3234.9–
−69.40−139.3234.9–
per 1 mol of
−34.70−69.64117.5–
−277.6−557.1939.6–
−92.53−185.7313.2–
per 1 mol of
−69.40−139.3234.9–

Changes in aqueous solution (3)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−570.1 kJ/mol
K7.54 × 1099
pK−99.88
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Gas + MnSO4Un-ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−263.4−570.11029.6–
per 1 mol of
−65.85−142.5257.40–
−65.85−142.5257.40–
per 1 mol of
−32.92−71.26128.70–
−263.4−570.11029.6–
−87.80−190.0343.20–
per 1 mol of
−65.85−142.5257.40–

Changes in aqueous solution (4)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−650.5 kJ/mol
K9.18 × 10113
pK−113.96
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Un-ionized aqueous solution + MnSO4Un-ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−536.8−650.5380.4–
per 1 mol of
−134.2−162.695.10–
−134.2−162.695.10–
per 1 mol of
−67.10−81.3147.55–
−536.8−650.5380.4–
−178.9−216.8126.8–
per 1 mol of
−134.2−162.695.10–

Changes in aqueous solution (5)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−637.5 kJ/mol
K4.84 × 10111
pK−111.69
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Un-ionized aqueous solution + MnSO4Ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−551.0−637.5290.4–
per 1 mol of
−137.8−159.472.60–
−137.8−159.472.60–
per 1 mol of
−68.88−79.6936.30–
−551.0−637.5290.4–
−183.7−212.596.80–
per 1 mol of
−137.8−159.472.60–

Changes in aqueous solution (6)

Reaction of ammonium sulfide and manganese(IV) oxide
◆
ΔrG−650.5 kJ/mol
K9.18 × 10113
pK−113.96
4(NH4)2SIonized aqueous solution + 4MnO2Crystalline solid
⟶
8NH3↑Un-ionized aqueous solution + MnSO4Un-ionized aqueous solution + 3MnSCrystalline solidgreen + 4H2OLiquid
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
−536.8−650.5380.4–
per 1 mol of
−134.2−162.695.10–
−134.2−162.695.10–
per 1 mol of
−67.10−81.3147.55–
−536.8−650.5380.4–
−178.9−216.8126.8–
per 1 mol of
−134.2−162.695.10–

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
(NH4)2S (ai)-231.8[1]-72.6[1]212.1[1]–
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]–––
* (ai):Ionized aqueous solution, (cr):Crystalline solid, (am):Amorphous solid

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
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]–
MnSO4 (cr)-1065.25[1]-957.36[1]112.1[1]100.50[1]
MnSO4 (ai)-1130.1[1]-972.7[1]-53.6[1]-243[1]
MnSO4 (ao)-1115.9[1]-985.7[1]36.4[1]–
MnSO4 (cr)
1 hydrate
α
-1376.5[1]–––
MnSO4 (cr)
1 hydrate
β
-1348.1[1]–––
MnSO4 (cr)
4 hydrate
-2258.1[1]–––
MnSO4 (cr)
5 hydrate
-2553.1[1]––326[1]
MnSO4 (cr)
7 hydrate
-3139.3[1]–––
MnS (cr)
green
-214.2[1]-218.4[1]78.2[1]49.96[1]
MnS (am)
precipitated, pink
-213.8[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]
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (ai):Ionized aqueous solution, (am):Amorphous solid, (l):Liquid

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)