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4H2 + 2AgSCN → Ag2S + NH4SCN + CH4

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Reaction of hydrogen and silver(I) thiocyanate
4H2Hydrogen + 2AgSCNSilver(I) thiocyanate
⟶
Ag2SSilver(I) sulfide + NH4SCNAmmonium thiocyanate + CH4Methane

The reaction of hydrogen and silver(I) thiocyanate yields silver(I) sulfide, ammonium thiocyanate, 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

Reaction of hydrogen and silver(I) thiocyanate
4H2Hydrogen + 2AgSCNSilver(I) thiocyanate
⟶
Ag2SSilver(I) sulfide + NH4SCNAmmonium thiocyanate + CH4Methane

General equation

Reaction of reducing species and reducible species
Reducing speciesReducing agent + Reducible speciesOxidizing agent
⟶
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reaction of hydrogen and silver(I) thiocyanate

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2Hydrogen4
Reducing
Reducing
AgSCNSilver(I) thiocyanate2
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
Ag2SSilver(I) sulfide1
–
–
NH4SCNAmmonium thiocyanate1
Oxidized
–
CH4Methane1
Redoxed product
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen and silver(I) thiocyanate
4H2Gas + 2AgSCNCrystalline solid
⟶
Ag2SCrystalline solidα, orthorhombic + NH4SCNCrystalline solid + CH4Gas
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
−361.9–––
per 1 mol of
−90.47–––
−180.9–––
per 1 mol of
−361.9–––
−361.9–––
per 1 mol of
−361.9–––

Changes in standard condition (2)

Reaction of hydrogen and silver(I) thiocyanate
4H2Gas + 2AgSCNCrystalline solid
⟶
Ag2SCrystalline solidβ + NH4SCNCrystalline solid + CH4Gas
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
−358.7–––
per 1 mol of
−89.67–––
−179.3–––
per 1 mol of
−358.7–––
−358.7–––
per 1 mol of
−358.7–––

Changes in aqueous solution (1)

Reaction of hydrogen and silver(I) thiocyanate
◆
ΔrG−488.0 kJ/mol
K3.12 × 1085
pK−85.49
4H2Un-ionized aqueous solution + 2AgSCNIonized aqueous solution
⟶
Ag2SCrystalline solidα, orthorhombic + NH4SCNIonized aqueous solution + CH4Gas
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
−510.7−488.0−2154–
per 1 mol of
−127.7−122.0−538.5–
−255.3−244.0−1077–
per 1 mol of
−510.7−488.0−2154–
−510.7−488.0−2154–
per 1 mol of
−510.7−488.0−2154–

Changes in aqueous solution (2)

Reaction of hydrogen and silver(I) thiocyanate
◆
ΔrG−471.6 kJ/mol
K4.18 × 1082
pK−82.62
4H2Un-ionized aqueous solution + 2AgSCNIonized aqueous solution
⟶
Ag2SCrystalline solidα, orthorhombic + NH4SCNIonized aqueous solution + CH4Un-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
−524.9−471.6−2257–
per 1 mol of
−131.2−117.9−564.3–
−262.4−235.8−1129–
per 1 mol of
−524.9−471.6−2257–
−524.9−471.6−2257–
per 1 mol of
−524.9−471.6−2257–

Changes in aqueous solution (3)

Reaction of hydrogen and silver(I) thiocyanate
◆
ΔrG−433.8 kJ/mol
K9.96 × 1075
pK−76.00
4H2Un-ionized aqueous solution + 2AgSCNUn-ionized aqueous solution
⟶
Ag2SCrystalline solidα, orthorhombic + NH4SCNIonized aqueous solution + CH4Gas
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
–−433.8––
per 1 mol of
–−108.5––
–−216.9––
per 1 mol of
–−433.8––
–−433.8––
per 1 mol of
–−433.8––

Changes in aqueous solution (4)

Reaction of hydrogen and silver(I) thiocyanate
◆
ΔrG−417.4 kJ/mol
K1.33 × 1073
pK−73.13
4H2Un-ionized aqueous solution + 2AgSCNUn-ionized aqueous solution
⟶
Ag2SCrystalline solidα, orthorhombic + NH4SCNIonized aqueous solution + CH4Un-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
–−417.4––
per 1 mol of
–−104.3––
–−208.7––
per 1 mol of
–−417.4––
–−417.4––
per 1 mol of
–−417.4––

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
H2 (g)0[1]0[1]130.684[1]28.824[1]
H2 (ao)-4.2[1]17.6[1]577[1]–
AgSCN (cr)87.9[1]101.39[1]131.0[1]63[1]
AgSCN (ai)182.00[1]169.80[1]217.1[1]-18.4[1]
AgSCN (ao)–142.7[1]––
* (g):Gas, (ao):Un-ionized aqueous solution, (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
Ag2S (cr)
α, orthorhombic
-32.59[1]-40.67[1]144.01[1]76.53[1]
Ag2S (cr)
β
-29.41[1]-39.46[1]150.6[1]–
NH4SCN (cr)-78.7[1]–––
NH4SCN (ai)-56.07[1]13.40[1]257.7[1]39.7[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]–
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (g):Gas, (ao):Un-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)