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8FeS + 36HNO3 → Fe2(SO4)3 + 6Fe(NO3)3 + 5SO3 + 9NH4NO3

The reaction of iron(II) sulfide and nitric acid yields iron(III) sulfate, iron(III) nitrate, sulfur trioxide, and ammonium nitrate (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

General equation

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

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
FeSIron(II) sulfide8
Reducing
Reducing
HNO3Nitric acid36
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
Fe2(SO4)3Iron(III) sulfate1
Oxidized
Fe(NO3)3Iron(III) nitrate6
Oxidized
SO3Sulfur trioxide5
Oxidized
NH4NO3Ammonium nitrate9
Reduced

Thermodynamic changes

Changes in aqueous solution (1)

Reaction of iron(II) sulfide and nitric acid
ΔrG−3050.5 kJ/mol
K2.66 × 10534
pK−534.42
8FeSCrystalline solidiron-rich pyrrhotite, α + 36HNO3Ionized aqueous solution
Fe2(SO4)3Ionized aqueous solution + 6Fe(NO3)3Ionized aqueous solution + 5SO3Crystalline solidβ + 9NH4NO3Ionized 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
−3915.6−3050.5−2892.1
per 1 mol of
−489.45−381.31−361.51
per 1 mol of
−108.77−84.736−80.336
per 1 mol of
−3915.6−3050.5−2892.1
per 1 mol of
−652.60−508.42−482.02
per 1 mol of
−783.12−610.10−578.42
per 1 mol of
−435.07−338.94−321.34

Changes in aqueous solution (2)

Reaction of iron(II) sulfide and nitric acid
8FeSCrystalline solidiron-rich pyrrhotite, α + 36HNO3Ionized aqueous solution
Fe2(SO4)3Ionized aqueous solution + 6Fe(NO3)3Aqueous solution + 5SO3Crystalline solidβ + 9NH4NO3Ionized 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
−3940.8
per 1 mol of
−492.60
per 1 mol of
−109.47
per 1 mol of
−3940.8
per 1 mol of
−656.80
per 1 mol of
−788.16
per 1 mol of
−437.87

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
FeS (cr)
iron-rich pyrrhotite, α
-100.0[1]-100.4[1]60.29[1]50.54[1]
HNO3 (l)-174.10[1]-80.71[1]155.60[1]109.87[1]
HNO3 (g)-135.06[1]-74.72[1]266.38[1]53.35[1]
HNO3 (ai)-207.36[1]-111.25[1]146.4[1]-86.6[1]
HNO3 (l)
1 hydrate
-473.46[1]-328.77[1]216.90[1]182.46[1]
HNO3 (l)
3 hydrate
-1056.04[1]-811.09[1]346.98[1]325.14[1]
* (cr):Crystalline solid, (l):Liquid, (g):Gas, (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
Fe2(SO4)3 (cr)-2581.5[1]
Fe2(SO4)3 (ai)-2825.0[1]-2242.8[1]-571.5[1]
Fe(NO3)3 (ai)-670.7[1]-338.3[1]123.4[1]
Fe(NO3)3 (aq)-674.9[1]
Fe(NO3)3 (cr)
9 hydrate
-3285.3[1]
SO3 (cr)
β
-454.51[1]-374.21[1]70.7[1]
SO3 (l)-441.04[1]-373.75[1]113.8[1]
SO3 (g)-395.72[1]-371.06[1]256.76[1]50.67[1]
NH4NO3 (cr)-365.56[1]-183.87[1]151.08[1]139.3[1]
NH4NO3 (ai)-339.87[1]-190.56[1]259.8[1]-6.7[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (aq):Aqueous solution, (l):Liquid, (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)