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2(NH4)2CrO4 ๐Ÿ”ฅโ†’ 4NH3โ†‘ + Cr2O3 + 2H2O + O3โ†‘

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Decomposition of ammonium chromate
2(NH4)2CrO4Ammonium chromate
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Ammonia + Cr2O3Chromium(III) oxide + 2H2OWater + O3โ†‘Ozone

Decomposition of ammonium chromate yields ammonia, chromium(III) oxide, water, and ozone (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 chromate
2(NH4)2CrO4Ammonium chromate
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Ammonia + Cr2O3Chromium(III) oxide + 2H2OWater + O3โ†‘Ozone

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 chromate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2CrO4Ammonium chromate2
Self redox agent
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
NH3Ammonia4
โ€“
โ€“
Cr2O3Chromium(III) oxide1
Reduced
โ€“
H2OWater2
โ€“
โ€“
O3Ozone1
Oxidized
โ€“

Thermodynamic changes

Changes in standard condition

Decomposition of ammonium chromate
2(NH4)2CrO4Crystalline solid
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Gas + Cr2O3Crystalline solid + 2H2OLiquid + O3โ†‘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
581.5โ€“โ€“โ€“
per 1 mol of
290.8โ€“โ€“โ€“
per 1 mol of
145.4โ€“โ€“โ€“
581.5โ€“โ€“โ€“
per 1 mol of
290.8โ€“โ€“โ€“
per 1 mol of
581.5โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of ammonium chromate
โ—†
ฮ”rG337.8 kJ/mol
K0.66 ร— 10โˆ’59
pK59.18
2(NH4)2CrO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Gas + Cr2O3Crystalline solid + 2H2OLiquid + O3โ†‘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
539.2337.8675.8โ€“
per 1 mol of
269.6168.9337.9โ€“
per 1 mol of
134.884.45168.9โ€“
539.2337.8675.8โ€“
per 1 mol of
269.6168.9337.9โ€“
per 1 mol of
539.2337.8675.8โ€“

Changes in aqueous solution (2)

Decomposition of ammonium chromate
โ—†
ฮ”rG348.7 kJ/mol
K0.81 ร— 10โˆ’61
pK61.09
2(NH4)2CrO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Gas + Cr2O3Crystalline solid + 2H2OLiquid + O3โ†‘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
522.4348.7583โ€“
per 1 mol of
261.2174.3292โ€“
per 1 mol of
130.687.17146โ€“
522.4348.7583โ€“
per 1 mol of
261.2174.3292โ€“
per 1 mol of
522.4348.7583โ€“

Changes in aqueous solution (3)

Decomposition of ammonium chromate
โ—†
ฮ”rG297.6 kJ/mol
K0.73 ร— 10โˆ’52
pK52.14
2(NH4)2CrO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Un-ionized aqueous solution + Cr2O3Crystalline solid + 2H2OLiquid + O3โ†‘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
402.5297.6351.2โ€“
per 1 mol of
201.3148.8175.6โ€“
per 1 mol of
100.674.4087.80โ€“
402.5297.6351.2โ€“
per 1 mol of
201.3148.8175.6โ€“
per 1 mol of
402.5297.6351.2โ€“

Changes in aqueous solution (4)

Decomposition of ammonium chromate
โ—†
ฮ”rG308.5 kJ/mol
K0.90 ร— 10โˆ’54
pK54.05
2(NH4)2CrO4Ionized aqueous solution
๐Ÿ”ฅ
โŸถ
4NH3โ†‘Un-ionized aqueous solution + Cr2O3Crystalline solid + 2H2OLiquid + O3โ†‘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
385.7308.5258โ€“
per 1 mol of
192.8154.3129โ€“
per 1 mol of
96.4277.1364.5โ€“
385.7308.5258โ€“
per 1 mol of
192.8154.3129โ€“
per 1 mol of
385.7308.5258โ€“

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)2CrO4 (cr)-1167.3[1]โ€“โ€“โ€“
(NH4)2CrO4 (ai)-1146.16[1]-886.36[1]277.0[1]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€“
Cr2O3 (cr)-1139.7[1]-1058.1[1]81.2[1]118.74[1]
Cr2O3 (cr)
1 hydrate
-1506[1]โ€“โ€“โ€“
Cr2O3 (cr)
2 hydrate
-1845[1]โ€“โ€“โ€“
Cr2O3 (cr)
3 hydrate
-2171[1]โ€“โ€“โ€“
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]
O3 (g)142.7[1]163.2[1]238.93[1]39.20[1]
O3 (ao)125.9[1]174.1[1]146[1]โ€“
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline 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)