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(NH4)3PO4 ๐Ÿ”ฅโ†’ 3NH3โ†‘ + PH3โ†‘ + 2O2โ†‘

Decomposition of ammonium phosphate
(NH4)3PO4Ammonium phosphate
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Ammonia + PH3โ†‘Phosphine + 2O2โ†‘Oxygen

Decomposition of ammonium phosphate yields ammonia, phosphine, and oxygen (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
(NH4)3PO4Ammonium phosphate
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Ammonia + PH3โ†‘Phosphine + 2O2โ†‘Oxygen

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 phosphate1
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH3Ammonia3
โ€“
โ€“
PH3Phosphine1
Reduced
โ€“
O2Oxygen2
Oxidized
โ€“

Thermodynamic changes

Changes in standard condition

Decomposition of ammonium phosphate
(NH4)3PO4Crystalline solid
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Gas + PH3โ†‘Gas + 2O2โ†‘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
1539.0โ€“โ€“โ€“
per 1 mol of
1539.0โ€“โ€“โ€“
per 1 mol of
513.00โ€“โ€“โ€“
per 1 mol of
1539.0โ€“โ€“โ€“
per 1 mol of
769.50โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1220.7 kJ/mol
K0.14 ร— 10โˆ’213
pK213.86
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Gas + PH3โ†‘Gas + 2O2โ†‘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
1542.01220.71081โ€“
per 1 mol of
1542.01220.71081โ€“
per 1 mol of
514.00406.90360.3โ€“
per 1 mol of
1542.01220.71081โ€“
per 1 mol of
771.00610.35540.5โ€“

Changes in aqueous solution (2)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1253.5 kJ/mol
K0.25 ร— 10โˆ’219
pK219.60
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Gas + PH3โ†‘Gas + 2O2โ†‘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
1518.61253.5892โ€“
per 1 mol of
1518.61253.5892โ€“
per 1 mol of
506.20417.83297โ€“
per 1 mol of
1518.61253.5892โ€“
per 1 mol of
759.30626.75446โ€“

Changes in aqueous solution (3)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1232.6 kJ/mol
K0.11 ร— 10โˆ’215
pK215.94
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Gas + PH3โ†‘Un-ionized aqueous solution + 2O2โ†‘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
1527.11232.6991โ€“
per 1 mol of
1527.11232.6991โ€“
per 1 mol of
509.03410.87330โ€“
per 1 mol of
1527.11232.6991โ€“
per 1 mol of
763.55616.30496โ€“

Changes in aqueous solution (4)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1265.4 kJ/mol
K0.20 ร— 10โˆ’221
pK221.69
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Gas + PH3โ†‘Un-ionized aqueous solution + 2O2โ†‘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
1503.71265.4802โ€“
per 1 mol of
1503.71265.4802โ€“
per 1 mol of
501.23421.80267โ€“
per 1 mol of
1503.71265.4802โ€“
per 1 mol of
751.85632.70401โ€“

Changes in aqueous solution (5)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1190.5 kJ/mol
K0.27 ร— 10โˆ’208
pK208.57
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Un-ionized aqueous solution + PH3โ†‘Gas + 2O2โ†‘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
1439.41190.5837โ€“
per 1 mol of
1439.41190.5837โ€“
per 1 mol of
479.80396.83279โ€“
per 1 mol of
1439.41190.5837โ€“
per 1 mol of
719.70595.25419โ€“

Changes in aqueous solution (6)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1223.3 kJ/mol
K0.49 ร— 10โˆ’214
pK214.31
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Un-ionized aqueous solution + PH3โ†‘Gas + 2O2โ†‘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
1416.01223.3649โ€“
per 1 mol of
1416.01223.3649โ€“
per 1 mol of
472.00407.77216โ€“
per 1 mol of
1416.01223.3649โ€“
per 1 mol of
708.00611.65325โ€“

Changes in aqueous solution (7)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1202.5 kJ/mol
K0.21 ร— 10โˆ’210
pK210.67
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Un-ionized aqueous solution + PH3โ†‘Un-ionized aqueous solution + 2O2โ†‘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
1424.51202.5747โ€“
per 1 mol of
1424.51202.5747โ€“
per 1 mol of
474.83400.83249โ€“
per 1 mol of
1424.51202.5747โ€“
per 1 mol of
712.25601.25374โ€“

Changes in aqueous solution (8)

Decomposition of ammonium phosphate
โ—†
ฮ”rG1235.3 kJ/mol
K0.38 ร— 10โˆ’216
pK216.42
(NH4)3PO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
3NH3โ†‘Un-ionized aqueous solution + PH3โ†‘Un-ionized aqueous solution + 2O2โ†‘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
1401.11235.3559โ€“
per 1 mol of
1401.11235.3559โ€“
per 1 mol of
467.03411.77186โ€“
per 1 mol of
1401.11235.3559โ€“
per 1 mol of
700.55617.65280โ€“

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
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€“
PH3 (g)5.4[1]13.4[1]210.23[1]37.11[1]
PH3 (ao)-9.50[1]25.36[1]120.1[1]โ€“
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]โ€“
* (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1