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NH4NO3 + 4MnO2 🔥→ Mn(NO3)2 + 2Mn(OH)2 + MnO

The reaction of ammonium nitrate and manganese(IV) oxide yields manganese(II) nitrate, manganese(II) hydroxide, and manganese(II) oxide (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 reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NH4NO3Ammonium nitrate1
Reducing
Reducing
MnO2Manganese(IV) oxide4
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Mn(NO3)2Manganese(II) nitrate1
Redoxed product
Mn(OH)2Manganese(II) hydroxide2
Reduced
MnOManganese(II) oxide1
Reduced

Thermodynamic changes

Changes in standard condition (1)

Reaction of ammonium nitrate and manganese(IV) oxide
NH4NO3Crystalline solid + 4MnO2Crystalline solid
🔥
Mn(NO3)2Crystalline solid + 2Mn(OH)2Amorphous solidprecipitated + MnOCrystalline solid
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
93.4
per 1 mol of
93.4
23.4
93.4
46.7
93.4

Changes in standard condition (2)

Reaction of ammonium nitrate and manganese(IV) oxide
NH4NO3Crystalline solid + 4MnO2Amorphous solidprecipitated
🔥
Mn(NO3)2Crystalline solid + 2Mn(OH)2Amorphous solidprecipitated + MnOCrystalline solid
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
23.3
per 1 mol of
23.3
5.83
23.3
11.7
23.3

Changes in aqueous solution

Reaction of ammonium nitrate and manganese(IV) oxide
ΔrG7.3 kJ/mol
K0.53 × 10−1
pK1.28
NH4NO3Ionized aqueous solution + 4MnO2Crystalline solid
🔥
Mn(NO3)2Ionized aqueous solution + 2Mn(OH)2Amorphous solidprecipitated + MnOCrystalline solid
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
8.57.34
per 1 mol of
8.57.34
2.11.81
8.57.34
4.33.62
8.57.34

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
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]
MnO2 (cr)-520.03[1]-465.14[1]53.05[1]54.14[1]
MnO2 (am)
precipitated
-502.5[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (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
Mn(NO3)2 (cr)-576.26[1]
Mn(NO3)2 (ai)-635.5[1]-450.9[1]218[1]-121[1]
Mn(NO3)2 (vit)
6 hydrate
-2371.9[1]
Mn(NO3)2 (l)
6 hydrate
-2331.62[1]
Mn(OH)2 (am)
precipitated
-695.4[1]-615.0[1]99.2[1]
MnO (cr)-385.22[1]-362.90[1]59.71[1]45.44[1]
MnO (g)124.22[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (vit):Vitreous liquid, (l):Liquid, (am):Amorphous solid, (g):Gas

References

List of references

  1. 1