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ZnS + I2 → ZnI2 + S

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Reaction of zinc sulfide and iodine
ZnSZinc sulfide + I2Iodine
⟶
ZnI2Zinc iodide + SSulfur

The reaction of zinc sulfide and iodine yields zinc iodide and sulfur. 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

Reaction of zinc sulfide and iodine
ZnSZinc sulfide + I2Iodine
⟶
ZnI2Zinc iodide + SSulfur

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 zinc sulfide and iodine

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
ZnSZinc sulfide1
Reducing
Reducing
I2Iodine1
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
ZnI2Zinc iodide1
Reduced
–
SSulfur1
Oxidized
–

Thermodynamic changes

Changes in standard condition (1)

Reaction of zinc sulfide and iodine
◆
ΔrG−7.66 kJ/mol
K2.20 × 101
pK−1.34
ZnSCrystalline solid + I2Crystalline solid
⟶
ZnI2Crystalline solid + SCrystalline solidrhombic
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
−2.05−7.6619.1–
per 1 mol of
−2.05−7.6619.1–
per 1 mol of
−2.05−7.6619.1–
per 1 mol of
−2.05−7.6619.1–
per 1 mol of
−2.05−7.6619.1–

Changes in standard condition (2)

Reaction of zinc sulfide and iodine
ZnSCrystalline solid + I2Crystalline solid
⟶
ZnI2Crystalline solid + SCrystalline solidmonoclinic
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
−1.72–––
per 1 mol of
−1.72–––
per 1 mol of
−1.72–––
per 1 mol of
−1.72–––
per 1 mol of
−1.72–––

Changes in aqueous solution (1)

Reaction of zinc sulfide and iodine
◆
ΔrG−65.31 kJ/mol
K2.77 × 1011
pK−11.44
ZnSCrystalline solid + I2Un-ionized aqueous solution
⟶
ZnI2Ionized aqueous solution + SCrystalline solidrhombic
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
−80.9−65.31−52.6–
per 1 mol of
−80.9−65.31−52.6–
per 1 mol of
−80.9−65.31−52.6–
per 1 mol of
−80.9−65.31−52.6–
per 1 mol of
−80.9−65.31−52.6–

Changes in aqueous solution (2)

Reaction of zinc sulfide and iodine
◆
ΔrG−55.7 kJ/mol
K5.73 × 109
pK−9.76
ZnSCrystalline solid + I2Un-ionized aqueous solution
⟶
ZnI2Un-ionized aqueous solution + SCrystalline solidrhombic
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
–−55.7––
per 1 mol of
–−55.7––
per 1 mol of
–−55.7––
per 1 mol of
–−55.7––
per 1 mol of
–−55.7––

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
ZnS (cr)-205.98[1]-201.29[1]57.7[1]46.0[1]
I2 (cr)0[1]0[1]116.135[1]54.438[1]
I2 (g)62.438[1]19.327[1]260.69[1]36.90[1]
I2 (ao)22.6[1]16.40[1]137.2[1]–
* (cr):Crystalline solid, (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
ZnI2 (cr)-208.03[1]-208.95[1]161.1[1]–
ZnI2 (ai)-264.26[1]-250.20[1]110.5[1]-238[1]
ZnI2 (ao)–-240.6[1]––
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]–––
S (g)278.805[1]238.250[1]167.821[1]23.673[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (g):Gas

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)