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3CaSO3 ๐Ÿ”ฅโ†’ 2CaSO4 + CaO + S

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Decomposition of calcium sulfite
3CaSO3Calcium sulfite
๐Ÿ”ฅ
โŸถ
2CaSO4Calcium sulfate + CaOCalcium oxide + SSulfur

Decomposition of calcium sulfite yields calcium sulfate, calcium oxide, and sulfur (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

Decomposition of calcium sulfite
3CaSO3Calcium sulfite
๐Ÿ”ฅ
โŸถ
2CaSO4Calcium sulfate + CaOCalcium oxide + SSulfur

General equation

Thermal decomposition with redox
Thermally decomposable substanceSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product
Thermal decomposition of oxoacid salt with redox
Oxoacid saltSelf redox agent
๐Ÿ”ฅ
โŸถ
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Decomposition of calcium sulfite

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
CaSO3Calcium sulfite3
โ€“
Thermally decomposable
Oxoacid salt

Products

Chemical formulaNameCoefficientTypeType in general
equation
CaSO4Calcium sulfate2
Oxidized
โ€“
CaOCalcium oxide1
โ€“
โ€“
SSulfur1
Reduced
โ€“

Thermodynamic changes

Changes in standard condition (1)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidinsoluble, anhydrite + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’19.2โˆ’10.37
per 1 mol of
โ€“โ€“โˆ’6.40โˆ’3.457
per 1 mol of
โ€“โ€“โˆ’9.60โˆ’5.185
per 1 mol of
โ€“โ€“โˆ’19.2โˆ’10.37
per 1 mol of
โ€“โ€“โˆ’19.2โˆ’10.37

Changes in standard condition (2)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidinsoluble, anhydrite + CaOCrystalline solid + SCrystalline solidmonoclinic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“

Changes in standard condition (3)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฑ + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’15.8โˆ’9.27
per 1 mol of
โ€“โ€“โˆ’5.27โˆ’3.09
per 1 mol of
โ€“โ€“โˆ’7.90โˆ’4.63
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’9.27
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’9.27

Changes in standard condition (4)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฑ + CaOCrystalline solid + SCrystalline solidmonoclinic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“

Changes in standard condition (5)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฒ + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’15.8โˆ’11.61
per 1 mol of
โ€“โ€“โˆ’5.27โˆ’3.870
per 1 mol of
โ€“โ€“โˆ’7.90โˆ’5.805
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’11.61
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’11.61

Changes in standard condition (6)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฒ + CaOCrystalline solid + SCrystalline solidmonoclinic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“
per 1 mol of
โ€“โ€“โ€“โ€“

Changes in aqueous solution (1)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidinsoluble, anhydrite + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’19.2โˆ’10.37
per 1 mol of
โ€“โ€“โˆ’6.40โˆ’3.457
per 1 mol of
โ€“โ€“โˆ’9.60โˆ’5.185
per 1 mol of
โ€“โ€“โˆ’19.2โˆ’10.37
per 1 mol of
โ€“โ€“โˆ’19.2โˆ’10.37

Changes in aqueous solution (2)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฑ + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’15.8โˆ’9.27
per 1 mol of
โ€“โ€“โˆ’5.27โˆ’3.09
per 1 mol of
โ€“โ€“โˆ’7.90โˆ’4.63
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’9.27
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’9.27

Changes in aqueous solution (3)

Decomposition of calcium sulfite
3CaSO3Crystalline solid
๐Ÿ”ฅ
โŸถ
2CaSO4Crystalline solidsoluble, ฮฒ + CaOCrystalline solid + SCrystalline solidrhombic
Standard enthalpy
of reaction
ฮ”rHยฐ
kJ ยท molโˆ’1		Standard
Gibbs energy
of reaction
ฮ”rGยฐ
kJ ยท molโˆ’1		Standard entropy
of reaction
ฮ”rSยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard heat
capacity of reaction
at constant pressure
ฮ”rCpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
per 1 mol of
Equation
โ€“โ€“โˆ’15.8โˆ’11.61
per 1 mol of
โ€“โ€“โˆ’5.27โˆ’3.870
per 1 mol of
โ€“โ€“โˆ’7.90โˆ’5.805
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’11.61
per 1 mol of
โ€“โ€“โˆ’15.8โˆ’11.61

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
CaSO3 (cr)โ€“โ€“101.38[1]91.71[1]
CaSO3 (cr)
0.5 hydrate
-1311.7[1]-1199.23[1]121.3[1]โ€“
* (cr):Crystalline solid

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ฮ”fHยฐ
kJ ยท molโˆ’1		Standard Gibbs
energy of
formation
ฮ”fGยฐ
kJ ยท molโˆ’1		Standard
molar entropy
Sยฐ
J ยท Kโˆ’1 ยท molโˆ’1		Standard molar
heat capacity at
constant pressure
Cpยฐ
J ยท Kโˆ’1 ยท molโˆ’1
CaSO4 (cr)
insoluble, anhydrite
-1434.11[1]-1321.79[1]106.7[1]99.66[1]
CaSO4 (cr)
soluble, ฮฑ
-1425.24[1]-1313.42[1]108.4[1]100.21[1]
CaSO4 (cr)
soluble, ฮฒ
-1420.80[1]-1308.98[1]108.4[1]99.04[1]
CaSO4 (ai)-1452.10[1]-1298.10[1]-33.1[1]โ€“
CaSO4 (cr)
0.5 hydrate
macrocrystalline, ฮฑ
-1576.74[1]-1436.74[1]130.5[1]119.41[1]
CaSO4 (cr)
0.5 hydrate
microcrystalline, ฮฒ
-1574.65[1]-1435.78[1]134.3[1]124.22[1]
CaSO4 (cr)
2 hydrate
selenite
-2022.63[1]-1797.28[1]194.1[1]186.02[1]
CaO (cr)-635.09[1]-604.03[1]39.75[1]42.80[1]
CaO (g)โ€“โ€“โ€“โ€“
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]โ€“โ€“โ€“
S (g)278.805[1]238.250[1]167.821[1]23.673[1]
* (cr):Crystalline solid, (ai):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)