calcium dihydroxide
- Formula: CaH2O2
- Molecular weight: 74.093
- CAS Registry Number: 1305-62-0
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Condensed phase thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°solid | -235.68 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 19.92 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1975 |
Solid Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1000. |
|---|---|
| A | 31.26800 |
| B | -19.76390 |
| C | 29.34250 |
| D | -12.04400 |
| E | -0.600656 |
| F | -246.3769 |
| G | 59.07880 |
| H | -235.6800 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1975 |
Reaction thermochemistry data
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
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Individual Reactions
H2CaO2 + 2 = CaCl2 + 2
+ 2
By formula: H2CaO2 + 2C2HCl5 = CaCl2 + 2C2Cl4 + 2H2O
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -43.40 | kcal/mol | Cm | Kirkbride, 1956 | liquid phase |
H2CaO2 + 2 = CaCl2 + 2
+ 2
By formula: H2CaO2 + 2C2H2Cl4 = CaCl2 + 2H2O + 2C2HCl3
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -36. | kcal/mol | Cm | Kirkbride, 1956 | liquid phase |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Kirkbride, 1956
Kirkbride, F.W.,
The heats of chlorination of some hydrocarbons and their chloro-derivatives,
J. Appl. Chem., 1956, 6, 11-21. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°solid Entropy of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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