dipotassium oxide
- Formula: K2O
- Molecular weight: 94.1960
- CAS Registry Number: 12136-45-7
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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 | -363.17 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1963 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 94.03 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1963 |
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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 700. | 700. to 2000. |
|---|---|---|
| A | 245.0104 | 72.55098 |
| B | -567.0492 | 41.39097 |
| C | 778.7219 | -0.728497 |
| D | -346.2641 | 0.218564 |
| E | -4.653361 | 0.066026 |
| F | -432.8599 | -386.1610 |
| G | 501.8708 | 170.5629 |
| H | -363.1712 | -363.1712 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1963 | Data last reviewed in June, 1963 |
References
Go To: Top, Condensed phase thermochemistry data, Notes
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]
Notes
Go To: Top, Condensed phase 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 - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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