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4(NH4)2CrO4 → N2H4 + 2HCr2O7 + 2OH + 6NH4+ + 2e

Oxidation of ammonium chromate
4(NH4)2CrO4Ammonium chromate
N2H4Hydrazine + 2HCr2O7Hydrogendichromate ion + 2OHHydroxide ion + 6NH4+Ammonium ion + 2eElectron

Oxidation of ammonium chromate yields hydrazine, hydrogendichromate ion, hydroxide ion, ammonium ion. 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 categories

Reaction data

Chemical equation

Oxidation of ammonium chromate
4(NH4)2CrO4Ammonium chromate
N2H4Hydrazine + 2HCr2O7Hydrogendichromate ion + 2OHHydroxide ion + 6NH4+Ammonium ion + 2eElectron

General equation

Oxidation of oxidizable species
ReactantReducing agent
ProductOxidation product + e

Oxidation state of each atom

Oxidation of ammonium chromate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
(NH4)2CrO4Ammonium chromate4
Reducing

Products

Chemical formulaNameCoefficientTypeType in general
equation
N2H4Hydrazine1
Oxidized
HCr2O7Hydrogendichromate ion2
OHHydroxide ion2
NH4+Ammonium ion6
eElectron2
Electron

Thermodynamic changes

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)2CrO4 (cr)-1167.3[1]
(NH4)2CrO4 (ai)-1146.16[1]-886.36[1]277.0[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution

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
N2H4 (l)50.63[1]149.34[1]121.21[1]98.87[1]
N2H4 (g)95.40[1]159.35[1]238.47[1]49.58[1]
N2H4 (ao)34.31[1]128.1[1]138[1]
HCr2O7
OH (g)-143.5[1]
OH (ao)-229.994[1]-157.244[1]-10.75[1]-148.5[1]
NH4+ (ao)-132.51[1]-79.31[1]113.4[1]79.9[1]
e
* (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution

References

List of references

  1. 1