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4H2S + 4MgCO3 🔥→ MgSO4 + 3MgS + 4CO + 4H2O

The reaction of hydrogen sulfide and magnesium carbonate yields magnesium sulfate, magnesium sulfide, carbon monoxide, 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

General equation

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

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2SHydrogen sulfide4
Reducing
Reducing
MgCO3Magnesium carbonate4
Oxidizing
Reducible

Products

Chemical formulaNameCoefficientTypeType in general
equation
MgSO4Magnesium sulfate1
Oxidized
MgSMagnesium sulfide3
COCarbon monoxide4
Reduced
H2OWater4

Thermodynamic changes

Changes in standard condition

Reaction of hydrogen sulfide and magnesium carbonate
ΔrG489.5 kJ/mol
K0.18 × 10−85
pK85.76
4H2SGas + 4MgCO3Crystalline solid
🔥
MgSO4Crystalline solid + 3MgSCrystalline solid + 4COGas + 4H2OLiquid
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
557.4489.5227.0211.89
per 1 mol of
139.3122.456.7552.972
139.3122.456.7552.972
per 1 mol of
557.4489.5227.0211.89
per 1 mol of
185.8163.275.6770.630
per 1 mol of
139.3122.456.7552.972
per 1 mol of
139.3122.456.7552.972

Changes in aqueous solution (1)

Reaction of hydrogen sulfide and magnesium carbonate
ΔrG437.6 kJ/mol
K0.22 × 10−76
pK76.66
4H2SUn-ionized aqueous solution + 4MgCO3Crystalline solid
🔥
MgSO4Ionized aqueous solution + 3MgSCrystalline solid + 4COGas + 4H2OLiquid
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
542.5437.6357
per 1 mol of
135.6109.489.3
135.6109.489.3
per 1 mol of
542.5437.6357
per 1 mol of
180.8145.9119
per 1 mol of
135.6109.489.3
per 1 mol of
135.6109.489.3

Changes in aqueous solution (2)

Reaction of hydrogen sulfide and magnesium carbonate
ΔrG506.7 kJ/mol
K0.17 × 10−88
pK88.77
4H2SUn-ionized aqueous solution + 4MgCO3Crystalline solid
🔥
MgSO4Ionized aqueous solution + 3MgSCrystalline solid + 4COUn-ionized aqueous solution + 4H2OLiquid
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
500.7506.7−16
per 1 mol of
125.2126.7−4.0
125.2126.7−4.0
per 1 mol of
500.7506.7−16
per 1 mol of
166.9168.9−5.3
per 1 mol of
125.2126.7−4.0
per 1 mol of
125.2126.7−4.0

Changes in aqueous solution (3)

Reaction of hydrogen sulfide and magnesium carbonate
ΔrG424.9 kJ/mol
K0.36 × 10−74
pK74.44
4H2SUn-ionized aqueous solution + 4MgCO3Crystalline solid
🔥
MgSO4Un-ionized aqueous solution + 3MgSCrystalline solid + 4COGas + 4H2OLiquid
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
562.6424.9467
per 1 mol of
140.7106.2117
140.7106.2117
per 1 mol of
562.6424.9467
per 1 mol of
187.5141.6156
per 1 mol of
140.7106.2117
per 1 mol of
140.7106.2117

Changes in aqueous solution (4)

Reaction of hydrogen sulfide and magnesium carbonate
ΔrG494.0 kJ/mol
K0.29 × 10−86
pK86.55
4H2SUn-ionized aqueous solution + 4MgCO3Crystalline solid
🔥
MgSO4Un-ionized aqueous solution + 3MgSCrystalline solid + 4COUn-ionized aqueous solution + 4H2OLiquid
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
520.8494.095
per 1 mol of
130.2123.524
130.2123.524
per 1 mol of
520.8494.095
per 1 mol of
173.6164.732
per 1 mol of
130.2123.524
per 1 mol of
130.2123.524

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
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]
MgCO3 (cr)-1095.8[1]-1012.1[1]65.7[1]75.52[1]
MgCO3 (cr)
3 hydrate
-1726.1[1]
MgCO3 (cr)
5 hydrate
-2199.2[1]
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid

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
MgSO4 (cr)-1284.9[1]-1170.6[1]91.6[1]96.48[1]
MgSO4 (ai)-1376.12[1]-1199.5[1]-118.0[1]
MgSO4 (ao)-1356.0[1]-1212.21[1]-7.1[1]
MgSO4 (cr)
1 hydrate
-1602.1[1]-1428.7[1]126.4[1]
MgSO4 (am)
1 hydrate
-1574.9[1]-1404.9[1]138.1[1]
MgSO4 (cr)
2 hydrate
-1896.2[1]
MgSO4 (cr)
4 hydrate
-2496.6[1]
MgSO4 (cr)
6 hydrate
-3087.0[1]-2631.8[1]348.1[1]348.11[1]
MgSO4 (cr)
7 hydrate
-3388.71[1]-2871.5[1]372[1]
MgS (cr)-346.0[1]-341.8[1]50.33[1]45.56[1]
CO (g)-110.525[1]-137.168[1]197.674[1]29.142[1]
CO (ao)-120.96[1]-119.90[1]104.6[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]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (ao):Un-ionized aqueous solution, (am):Amorphous solid, (g):Gas, (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)