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5NH4CN 🔥→ 3N2H4 + 4HCN + CH4↑

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Decomposition of ammonium cyanide
5NH4CNAmmonium cyanide
🔥
⟶
3N2H4Hydrazine + 4HCNHydrogen cyanide + CH4↑Methane

Decomposition of ammonium cyanide yields hydrazine, hydrogen cyanide, and methane (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 cyanide
5NH4CNAmmonium cyanide
🔥
⟶
3N2H4Hydrazine + 4HCNHydrogen cyanide + CH4↑Methane

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
🔥
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of ammonium cyanide

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NH4CNAmmonium cyanide5
Self redox agent
Thermally decomposable

Products

Chemical formulaNameCoefficientTypeType in general
equation
N2H4Hydrazine3
Oxidized
–
HCNHydrogen cyanide4
–
–
CH4Methane1
Reduced
–

Thermodynamic changes

Changes in standard condition

Decomposition of ammonium cyanide
5NH4CNCrystalline solid
🔥
⟶
3N2H4Liquid + 4HCNLiquid + CH4↑Gas
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
510.46––−56
per 1 mol of
102.09––−11
per 1 mol of
170.15––−19
per 1 mol of
127.61––−14
per 1 mol of
510.46––−56

Changes in aqueous solution (1)

Decomposition of ammonium cyanide
◆
ΔrG347.4 kJ/mol
K0.14 × 10−60
pK60.86
5NH4CNIonized aqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNUn-ionized aqueous solution + CH4↑Gas
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
366.5347.462–
per 1 mol of
73.3069.4812–
per 1 mol of
122.2115.821–
per 1 mol of
91.6386.8516–
per 1 mol of
366.5347.462–

Changes in aqueous solution (2)

Decomposition of ammonium cyanide
◆
ΔrG363.8 kJ/mol
K0.18 × 10−63
pK63.74
5NH4CNIonized aqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNUn-ionized aqueous solution + CH4↑Un-ionized aqueous solution
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
352.3363.8−41–
per 1 mol of
70.4672.76−8.2–
per 1 mol of
117.4121.3−14–
per 1 mol of
88.0890.95−10–
per 1 mol of
352.3363.8−41–

Changes in aqueous solution (3)

Decomposition of ammonium cyanide
5NH4CNAqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNUn-ionized aqueous solution + CH4↑Gas
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
295.5–––
per 1 mol of
59.10–––
per 1 mol of
98.50–––
per 1 mol of
73.88–––
per 1 mol of
295.5–––

Changes in aqueous solution (4)

Decomposition of ammonium cyanide
5NH4CNAqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNUn-ionized aqueous solution + CH4↑Un-ionized aqueous solution
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
281.3–––
per 1 mol of
56.26–––
per 1 mol of
93.77–––
per 1 mol of
70.33–––
per 1 mol of
281.3–––

Changes in aqueous solution (5)

Decomposition of ammonium cyanide
◆
ΔrG558.2 kJ/mol
K0.16 × 10−97
pK97.79
5NH4CNIonized aqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNIonized aqueous solution + CH4↑Gas
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
540.5558.2−61–
per 1 mol of
108.1111.6−12–
per 1 mol of
180.2186.1−20–
per 1 mol of
135.1139.6−15–
per 1 mol of
540.5558.2−61–

Changes in aqueous solution (6)

Decomposition of ammonium cyanide
◆
ΔrG574.6 kJ/mol
K0.22 × 10−100
pK100.67
5NH4CNIonized aqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNIonized aqueous solution + CH4↑Un-ionized aqueous solution
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
526.3574.6−163–
per 1 mol of
105.3114.9−32.6–
per 1 mol of
175.4191.5−54.3–
per 1 mol of
131.6143.7−40.8–
per 1 mol of
526.3574.6−163–

Changes in aqueous solution (7)

Decomposition of ammonium cyanide
5NH4CNAqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNIonized aqueous solution + CH4↑Gas
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
469.5–––
per 1 mol of
93.90–––
per 1 mol of
156.5–––
per 1 mol of
117.4–––
per 1 mol of
469.5–––

Changes in aqueous solution (8)

Decomposition of ammonium cyanide
5NH4CNAqueous solution
🔥
⟶
3N2H4Un-ionized aqueous solution + 4HCNIonized aqueous solution + CH4↑Un-ionized aqueous solution
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
455.3–––
per 1 mol of
91.06–––
per 1 mol of
151.8–––
per 1 mol of
113.8–––
per 1 mol of
455.3–––

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
NH4CN (cr)0.42[1]––134[1]
NH4CN (ai)18.0[1]93.0[1]207.5[1]–
NH4CN (aq)32.2[1]–––
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (aq):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]–
HCN (l)108.87[1]124.97[1]112.84[1]70.63[1]
HCN (g)135.1[1]124.7[1]201.78[1]35.86[1]
HCN (ai)150.6[1]172.4[1]94.1[1]–
HCN (ao)107.1[1]119.7[1]124.7[1]–
CH4 (g)-74.81[1]-50.72[1]186.264[1]35.309[1]
CH4 (ao)-89.04[1]-34.33[1]83.7[1]–
* (l):Liquid, (g):Gas, (ao):Un-ionized aqueous solution, (ai):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)