disodium sulphide
- Formula: Na2S
- Molecular weight: 78.045
- CAS Registry Number: 1313-82-2
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Solid Phase Heat Capacity (Shomate Equation)
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.
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. | 1000. to 1276. | 1276. to 1445. |
|---|---|---|---|
| A | 18.73513 | 13867.88 | -129545.9 |
| B | 3.333700 | -25021.27 | 188602.1 |
| C | 0.658050 | 16739.29 | -103227.1 |
| D | -0.561183 | -3913.671 | 20134.89 |
| E | 0.001984 | -1650.069 | 24717.02 |
| F | -93.23208 | -7681.405 | 89211.04 |
| G | 44.66587 | 17179.30 | -131343.7 |
| H | -87.50000 | -87.50000 | -87.50000 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in March, 1978 | Data last reviewed in March, 1978 | Data last reviewed in March, 1978 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 298. | 19.79 | 22.99 | 23.00 | -0.00 |
| 300. | 19.80 | 23.12 | 23.00 | 0.04 |
| 400. | 20.15 | 28.87 | 23.78 | 2.03 |
| 500. | 20.50 | 33.40 | 25.27 | 4.07 |
| 600. | 20.86 | 37.17 | 26.95 | 6.13 |
| 700. | 21.20 | 40.41 | 28.64 | 8.24 |
| 800. | 21.54 | 43.27 | 30.30 | 10.38 |
| 900. | 21.86 | 45.82 | 31.88 | 12.55 |
| 1000. | 22.17 | 48.14 | 33.39 | 14.75 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1000. | 22.16 | 48.15 | 33.40 | 14.75 |
| 1100. | 26.23 | 50.41 | 34.84 | 17.12 |
| 1200. | 38.23 | 53.15 | 36.25 | 20.28 |
| Temperature (K) |
Cp (cal/mol*K) |
S° (cal/mol*K) |
-(G° - H°298.15)/T (cal/mol*K) |
H° - H°298.15 (kcal/mol) |
|---|---|---|---|---|
| 1276. | 50.62 | 55.75 | 37.26 | 23.60 |
| 1300. | 44.88 | 56.64 | 37.61 | 24.74 |
| 1400. | 32.83 | 59.43 | 39.07 | 28.51 |
References
Go To: Top, Solid Phase Heat Capacity (Shomate Equation), 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, Solid Phase Heat Capacity (Shomate Equation), References
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