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2NH4CN + 7O2 → 4HNO2 + 2CO2 + 2H2O

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Reaction of ammonium cyanide and oxygen
2NH4CNAmmonium cyanide + 7O2Oxygen
⟶
4HNO2Nitrous acid + 2CO2Carbon dioxide + 2H2OWater

The reaction of ammonium cyanide and oxygen yields nitrous acid, carbon dioxide, and water (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

Reaction of ammonium cyanide and oxygen
2NH4CNAmmonium cyanide + 7O2Oxygen
⟶
4HNO2Nitrous acid + 2CO2Carbon dioxide + 2H2OWater

General equation

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of ammonium cyanide and oxygen

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
NH4CNAmmonium cyanide2
Reducing
Reducing
O2Oxygen7
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
HNO2Nitrous acid4
Redoxed product
–
CO2Carbon dioxide2
Redoxed product
–
H2OWater2
Reduced
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of ammonium cyanide and oxygen
◆
ΔrG−1766.2 kJ/mol
K2.66 × 10309
pK−309.42
2NH4CNIonized aqueous solution + 7O2Un-ionized aqueous solution
⟶
4HNO2Un-ionized aqueous solution + 2CO2Gas + 2H2OLiquid
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
−1789.6−1766.2−81.6–
per 1 mol of
−894.80−883.10−40.8–
per 1 mol of
−255.66−252.31−11.7–
per 1 mol of
−447.40−441.55−20.4–
per 1 mol of
−894.80−883.10−40.8–
per 1 mol of
−894.80−883.10−40.8–

Changes in standard condition (2)

Reaction of ammonium cyanide and oxygen
◆
ΔrG−1749.4 kJ/mol
K3.03 × 10306
pK−306.48
2NH4CNIonized aqueous solution + 7O2Un-ionized aqueous solution
⟶
4HNO2Un-ionized aqueous solution + 2CO2Un-ionized aqueous solution + 2H2OLiquid
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
−1830.2−1749.4−273.9–
per 1 mol of
−915.10−874.70−136.9–
per 1 mol of
−261.46−249.91−39.13–
per 1 mol of
−457.55−437.35−68.47–
per 1 mol of
−915.10−874.70−136.9–
per 1 mol of
−915.10−874.70−136.9–

Changes in standard condition (3)

Reaction of ammonium cyanide and oxygen
2NH4CNAqueous solution + 7O2Un-ionized aqueous solution
⟶
4HNO2Un-ionized aqueous solution + 2CO2Gas + 2H2OLiquid
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
−1818.0–––
per 1 mol of
−909.00–––
per 1 mol of
−259.71–––
per 1 mol of
−454.50–––
per 1 mol of
−909.00–––
per 1 mol of
−909.00–––

Changes in standard condition (4)

Reaction of ammonium cyanide and oxygen
2NH4CNAqueous solution + 7O2Un-ionized aqueous solution
⟶
4HNO2Un-ionized aqueous solution + 2CO2Un-ionized aqueous solution + 2H2OLiquid
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
−1858.6–––
per 1 mol of
−929.30–––
per 1 mol of
−265.51–––
per 1 mol of
−464.65–––
per 1 mol of
−929.30–––
per 1 mol of
−929.30–––

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]–––
O2 (g)0[1]0[1]205.138[1]29.355[1]
O2 (ao)-11.7[1]16.4[1]110.9[1]–
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (aq):Aqueous solution, (g):Gas, (ao):Un-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
HNO2 (g)
cis
-77.99[1]-42.94[1]248.76[1]44.77[1]
HNO2 (g)
trans
-80.12[1]-45.24[1]249.22[1]46.07[1]
HNO2 (g)-79.5[1]-46.0[1]254.1[1]45.6[1]
HNO2 (ao)-119.2[1]-50.6[1]135.6[1]–
CO2 (g)-393.509[1]-394.359[1]213.74[1]37.11[1]
CO2 (ao)-413.80[1]-385.98[1]117.6[1]–
H2O (cr)––––
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]
* (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)