potassium sulfate
- Formula: K2O4S
- Molecular weight: 174.259
- CAS Registry Number: 7778-80-5
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Gas 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°gas | -261.501 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1978 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 87.510 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1978 |
Gas 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) | 3000. - 6000. |
|---|---|
| A | 37.52180 |
| B | 0.131105 |
| C | -0.026490 |
| D | 0.001832 |
| E | -1.889761 |
| F | -278.0220 |
| G | 124.8590 |
| H | -261.5000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in June, 1978 |
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°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. - 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. - 1200. | 298. - 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 |
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 as indicated in comments:
MS - José A. Martinho Simões
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
C2H5KO (cr) + 0.5( • 1100
) (solution) =
(solution) + 0.5K2O4S (solution)
By formula: C2H5KO (cr) + 0.5(H2O4S • 1100H2O) (solution) = C2H6O (solution) + 0.5K2O4S (solution)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -31.62 ± 0.69 | kcal/mol | RSC | Blanchard, Joly, et al., 1974 | solvent: Sulphuric acid aqueous solution; The reaction enthalpy relies on -2.53 kcal/mol for the enthalpy of solution of EtOH(l) and on 35.1±0.1 for the enthalpy of solution of K2SO4(cr) Blanchard, Joly, et al., 1974.; MS |
+ K2O4S = (
• K2O4S)
By formula: K+ + K2O4S = (K+ • K2O4S)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 38. | kcal/mol | MS | Kudin, Gusarov, et al., 1973 | gas phase; Knudsen cell; M |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction 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]
Blanchard, Joly, et al., 1974
Blanchard, J.M.; Joly, R.D.; Lettoffe, J.M.; Perachon, G.; Thourey, J.,
J. Chim. Phys. Phys.-Chim. Biol., 1974, 71, 472. [all data]
Kudin, Gusarov, et al., 1973
Kudin, L.S.; Gusarov, A.V.; Gorokhov, L.N.,
Mass Spectrometer Study of Equilibria Involving Ions. 1. Potassium Bromide and Sulfate,
High Temp., 1973, 11, 50. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid 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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