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12(NH4)3PO4 ๐Ÿ”ฅโ†’ 5N2O3โ†‘ + 12P + 33H2O + 26NH3โ†‘

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Decomposition of ammonium phosphate
12(NH4)3PO4Ammonium phosphate
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Dinitrogen trioxide + 12PPhosphorus + 33H2OWater + 26NH3โ†‘Ammonia

Decomposition of ammonium phosphate yields dinitrogen trioxide, phosphorus, 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 phosphate
12(NH4)3PO4Ammonium phosphate
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Dinitrogen trioxide + 12PPhosphorus + 33H2OWater + 26NH3โ†‘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 phosphate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)3PO4Ammonium phosphate12
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
N2O3Dinitrogen trioxide5
Oxidized
โ€“
PPhosphorus12
Reduced
โ€“
H2OWater33
โ€“
โ€“
NH3Ammonia26
โ€“
โ€“

Thermodynamic changes

Changes in standard condition (1)

Decomposition of ammonium phosphate
12(NH4)3PO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PCrystalline solidwhite + 33H2OLiquid + 26NH3โ†‘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
9850.2โ€“โ€“โ€“
per 1 mol of
820.85โ€“โ€“โ€“
1970.0โ€“โ€“โ€“
per 1 mol of
820.85โ€“โ€“โ€“
per 1 mol of
298.49โ€“โ€“โ€“
per 1 mol of
378.85โ€“โ€“โ€“

Changes in standard condition (2)

Decomposition of ammonium phosphate
12(NH4)3PO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PCrystalline solidred, triclinic + 33H2OLiquid + 26NH3โ†‘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
9639.0โ€“โ€“โ€“
per 1 mol of
803.25โ€“โ€“โ€“
1927.8โ€“โ€“โ€“
per 1 mol of
803.25โ€“โ€“โ€“
per 1 mol of
292.09โ€“โ€“โ€“
per 1 mol of
370.73โ€“โ€“โ€“

Changes in standard condition (3)

Decomposition of ammonium phosphate
12(NH4)3PO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PCrystalline solidblack + 33H2OLiquid + 26NH3โ†‘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
9378.6โ€“โ€“โ€“
per 1 mol of
781.55โ€“โ€“โ€“
1875.7โ€“โ€“โ€“
per 1 mol of
781.55โ€“โ€“โ€“
per 1 mol of
284.20โ€“โ€“โ€“
per 1 mol of
360.72โ€“โ€“โ€“

Changes in standard condition (4)

Decomposition of ammonium phosphate
12(NH4)3PO4Crystalline solid
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PAmorphous solidred + 33H2OLiquid + 26NH3โ†‘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
9760.2โ€“โ€“โ€“
per 1 mol of
813.35โ€“โ€“โ€“
1952.0โ€“โ€“โ€“
per 1 mol of
813.35โ€“โ€“โ€“
per 1 mol of
295.76โ€“โ€“โ€“
per 1 mol of
375.39โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of ammonium phosphate
โ—†
ฮ”rG7523.5 kJ/mol
K0.87 ร— 10โˆ’1318
pK1318.06
12(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PCrystalline solidwhite + 33H2OLiquid + 26NH3โ†‘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
9886.27523.57961โ€“
per 1 mol of
823.85626.96663.4โ€“
1977.21504.71592โ€“
per 1 mol of
823.85626.96663.4โ€“
per 1 mol of
299.58227.98241.2โ€“
per 1 mol of
380.24289.37306.2โ€“

Changes in aqueous solution (2)

Decomposition of ammonium phosphate
โ—†
ฮ”rG7262.2 kJ/mol
K0.52 ร— 10โˆ’1272
pK1272.28
12(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
5N2O3โ†‘Gas + 12PCrystalline solidwhite + 33H2OLiquid + 26NH3โ†‘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
8997.57262.25851โ€“
per 1 mol of
749.79605.18487.6โ€“
1799.51452.41170โ€“
per 1 mol of
749.79605.18487.6โ€“
per 1 mol of
272.65220.07177.3โ€“
per 1 mol of
346.06279.32225.0โ€“

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)3PO4 (cr)-1671.9[1]โ€“โ€“โ€“
(NH4)3PO4 (ai)-1674.9[1]-1256.6[1]117[1]โ€“
(NH4)3PO4 (cr)
3 hydrate
-2555.6[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]
P (cr)
white
0[1]0[1]41.09[1]23.84[1]
P (cr)
red, triclinic
-17.6[1]-12.1[1]22.80[1]21.21[1]
P (cr)
black
-39.3[1]โ€“โ€“โ€“
P (am)
red
-7.5[1]โ€“โ€“โ€“
P (g)314.64[1]278.25[1]163.193[1]20.786[1]
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, (cr):Crystalline solid, (am):Amorphous 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)