CaSiO3 🔥→ CaO + SiO2
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- Decomposition of calcium metasilicate
Decomposition of calcium metasilicate yields calcium oxide and silicon dioxide (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:
- Thermal decomposition without redox
- Thermal decomposition of oxoacid salt without redox
- Thermal decomposition of salt of oxoacid and hydroxide base
Table of contents
Reaction data
Chemical equation
- Decomposition of calcium metasilicate
General equation
- Thermal decomposition without redox
- Thermally decomposable substanceLewis conjugate🔥⟶ ProductLewis acid + ProductLewis base
- Thermal decomposition of oxoacid salt without redox
- Oxoacid saltLewis conjugate🔥⟶ Basic oxideLewis base + Acidic oxideLewis acid + (H2O)
- Thermal decomposition of salt of oxoacid and hydroxide base
- Salt of oxoacid and hydroxide baseLewis conjugate🔥⟶ Basic oxideLewis base + Acidic oxideLewis acid
Oxidation state of each atom
- Decomposition of calcium metasilicate
Reactants
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaSiO3 | Calcium metasilicate | 1 | Lewis conjugate | Thermally decomposable Oxoacid salt Salt of oxoacid and hydroxide base |
Products
| Chemical formula | Name | Coefficient | Type | Type in general equation |
|---|---|---|---|---|
| CaO | Calcium oxide | 1 | Lewis acid Lewis base | – Basic oxide |
| SiO2 | Silicon dioxide | 1 | Lewis acid | – Acidic oxide |
Thermodynamic changes
Changes in standard condition (1)
- Decomposition of calcium metasilicate◆
ΔrG 88.99 kJ/mol K 0.26 × 10−15 pK 15.59
| 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 | 88.91 | 88.99 | −0.33 | 1.96 |
per 1 mol of | 88.91 | 88.99 | −0.330 | 1.96 |
per 1 mol of | 88.91 | 88.99 | −0.330 | 1.96 |
per 1 mol of | 88.91 | 88.99 | −0.330 | 1.96 |
Changes in standard condition (2)
- Decomposition of calcium metasilicate◆
ΔrG 90.20 kJ/mol K 0.16 × 10−15 pK 15.80
| 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 | 90.37 | 90.20 | 0.51 | 1.71 |
per 1 mol of | 90.37 | 90.20 | 0.510 | 1.71 |
per 1 mol of | 90.37 | 90.20 | 0.510 | 1.71 |
per 1 mol of | 90.37 | 90.20 | 0.510 | 1.71 |
Changes in standard condition (3)
- Decomposition of calcium metasilicate◆
ΔrG 90.37 kJ/mol K 0.15 × 10−15 pK 15.83
| 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 | 90.79 | 90.37 | 1.3 | 2.13 |
per 1 mol of | 90.79 | 90.37 | 1.3 | 2.13 |
per 1 mol of | 90.79 | 90.37 | 1.3 | 2.13 |
per 1 mol of | 90.79 | 90.37 | 1.3 | 2.13 |
Changes in standard condition (4)
- Decomposition of calcium metasilicate◆
ΔrG 94.93 kJ/mol K 0.23 × 10−16 pK 16.63
| 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 | 96.36 | 94.93 | 4.7 | 1.9 |
per 1 mol of | 96.36 | 94.93 | 4.7 | 1.9 |
per 1 mol of | 96.36 | 94.93 | 4.7 | 1.9 |
per 1 mol of | 96.36 | 94.93 | 4.7 | 1.9 |
Changes in standard condition (5)
- Decomposition of calcium metasilicate◆
ΔrG 84.0 kJ/mol K 0.19 × 10−14 pK 14.72
| 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 | 82.4 | 84.0 | −5.77 | 0.75 |
per 1 mol of | 82.4 | 84.0 | −5.77 | 0.750 |
per 1 mol of | 82.4 | 84.0 | −5.77 | 0.750 |
per 1 mol of | 82.4 | 84.0 | −5.77 | 0.750 |
Changes in standard condition (6)
- Decomposition of calcium metasilicate◆
ΔrG 85.2 kJ/mol K 0.12 × 10−14 pK 14.93
| 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 | 83.8 | 85.2 | −4.93 | 0.50 |
per 1 mol of | 83.8 | 85.2 | −4.93 | 0.500 |
per 1 mol of | 83.8 | 85.2 | −4.93 | 0.500 |
per 1 mol of | 83.8 | 85.2 | −4.93 | 0.500 |
Changes in standard condition (7)
- Decomposition of calcium metasilicate◆
ΔrG 85.4 kJ/mol K 0.11 × 10−14 pK 14.96
| 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 | 84.3 | 85.4 | −4.1 | 0.92 |
per 1 mol of | 84.3 | 85.4 | −4.1 | 0.920 |
per 1 mol of | 84.3 | 85.4 | −4.1 | 0.920 |
per 1 mol of | 84.3 | 85.4 | −4.1 | 0.920 |
Changes in standard condition (8)
- Decomposition of calcium metasilicate◆
ΔrG 90.0 kJ/mol K 0.17 × 10−15 pK 15.77
| 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 | 89.8 | 90.0 | −0.7 | 0.7 |
per 1 mol of | 89.8 | 90.0 | −0.70 | 0.70 |
per 1 mol of | 89.8 | 90.0 | −0.70 | 0.70 |
per 1 mol of | 89.8 | 90.0 | −0.70 | 0.70 |
Changes in aqueous solution
- Decomposition of calcium metasilicate
| 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 | 102.9 | – | – | – |
per 1 mol of | 102.9 | – | – | – |
per 1 mol of | 102.9 | – | – | – |
per 1 mol of | 102.9 | – | – | – |
Thermodynamic data of reactants
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| CaSiO3 (cr) wollastonite | -1634.94[1] | -1549.66[1] | 81.92[1] | 85.27[1] |
| CaSiO3 (cr) pseudowollastonite | -1628.4[1] | -1544.7[1] | 87.36[1] | 86.48[1] |
| CaSiO3 (vit) | -1601.01[1] | – | – | – |
* (cr):Crystalline solid, (vit):Vitreous liquid
Thermodynamic data of products
| Chemical formula | Standard 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 |
|---|---|---|---|---|
| CaO (cr) | -635.09[1] | -604.03[1] | 39.75[1] | 42.80[1] |
| CaO (g) | – | – | – | – |
| SiO2 (cr) α-quartz | -910.94[1] | -856.64[1] | 41.84[1] | 44.43[1] |
| SiO2 (cr) α-cristobalite | -909.48[1] | -855.43[1] | 42.68[1] | 44.18[1] |
| SiO2 (cr) α-tridymite | -909.06[1] | -855.26[1] | 43.5[1] | 44.60[1] |
| SiO2 (am) | -903.49[1] | -850.70[1] | 46.9[1] | 44.4[1] |
| SiO2 (g) | -322[1] | – | – | – |
| SiO2 (ao) | -897.0[1] | – | – | – |
* (cr):Crystalline solid, (g):Gas, (am):Amorphous solid, (ao):Un-ionized aqueous solution
References
List of references
- 1Janiel J. Reed (1989)The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI UnitsNational Institute of Standards and Technology (NIST)
- ^ ΔfH°, -1634.94 kJ · mol−1
- ^ ΔfG°, -1549.66 kJ · mol−1
- ^ S°, 81.92 J · K−1 · mol−1
- ^ Cp°, 85.27 J · K−1 · mol−1
- ^ ΔfH°, -1628.4 kJ · mol−1
- ^ ΔfG°, -1544.7 kJ · mol−1
- ^ S°, 87.36 J · K−1 · mol−1
- ^ Cp°, 86.48 J · K−1 · mol−1
- ^ ΔfH°, -1601.01 kJ · mol−1
- ^ ΔfH°, -635.09 kJ · mol−1
- ^ ΔfG°, -604.03 kJ · mol−1
- ^ S°, 39.75 J · K−1 · mol−1
- ^ Cp°, 42.80 J · K−1 · mol−1
- ^ ΔfH°, -910.94 kJ · mol−1
- ^ ΔfG°, -856.64 kJ · mol−1
- ^ S°, 41.84 J · K−1 · mol−1
- ^ Cp°, 44.43 J · K−1 · mol−1
- ^ ΔfH°, -909.48 kJ · mol−1
- ^ ΔfG°, -855.43 kJ · mol−1
- ^ S°, 42.68 J · K−1 · mol−1
- ^ Cp°, 44.18 J · K−1 · mol−1
- ^ ΔfH°, -909.06 kJ · mol−1
- ^ ΔfG°, -855.26 kJ · mol−1
- ^ S°, 43.5 J · K−1 · mol−1
- ^ Cp°, 44.60 J · K−1 · mol−1
- ^ ΔfH°, -903.49 kJ · mol−1
- ^ ΔfG°, -850.70 kJ · mol−1
- ^ S°, 46.9 J · K−1 · mol−1
- ^ Cp°, 44.4 J · K−1 · mol−1
- ^ ΔfH°, -322. kJ · mol−1
- ^ ΔfH°, -897.0 kJ · mol−1