potassium sulfate
- Formula: K2O4S
- Molecular weight: 174.259
- CAS Registry Number: 7778-80-5
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Condensed phase thermochemistry data
Go To: Top, References, Notes
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°liquid | -333.095 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid,1 bar | 50.531 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔfH°solid | -343.621 | kcal/mol | Review | Chase, 1998 | α phase; Data last reviewed in June, 1978 |
Liquid 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) | 1342. to 3000. |
|---|---|
| A | 48.15019 |
| B | 0.000000 |
| C | 0.000000 |
| D | 0.000000 |
| E | 0.000000 |
| F | -351.6429 |
| G | 99.30729 |
| H | -333.0949 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1978 |
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 1200. | 298. to 1342. |
|---|---|---|
| A | 33.34250 | 27.32849 |
| B | -0.286779 | 19.43010 |
| C | 32.69790 | -0.000225 |
| D | -11.26750 | -0.003871 |
| E | -0.397705 | 0.000034 |
| F | -355.1539 | -349.4140 |
| G | 78.78891 | 73.23499 |
| H | -343.6200 | -340.4030 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | α phase; Data last reviewed in June, 1978 | β phase; Data last reviewed in June, 1978 |
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°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°liquid Enthalpy of formation of liquid 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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