Magnesium boride
- Formula: B4Mg
- Molecular weight: 67.549
- CAS Registry Number: 12007-74-8
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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. - 2000. |
|---|---|
| A | 10.98620 |
| B | 24.51551 |
| C | -9.298430 |
| D | 1.348480 |
| E | -0.060305 |
| F | -29.59011 |
| G | 18.45270 |
| H | -25.09990 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1965 |
| 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. | 16.82 | 12.40 | 12.41 | -0.00 |
| 300. | 16.87 | 12.51 | 12.41 | 0.03 |
| 400. | 19.01 | 17.67 | 13.10 | 1.83 |
| 500. | 20.85 | 22.11 | 14.47 | 3.82 |
| 600. | 22.47 | 26.06 | 16.08 | 5.99 |
| 700. | 23.93 | 29.63 | 17.76 | 8.31 |
| 800. | 25.24 | 32.92 | 19.45 | 10.77 |
| 900. | 26.43 | 35.96 | 21.12 | 13.35 |
| 1000. | 27.49 | 38.80 | 22.75 | 16.05 |
| 1100. | 28.45 | 41.46 | 24.33 | 18.85 |
| 1200. | 29.30 | 43.98 | 25.86 | 21.74 |
| 1300. | 30.07 | 46.35 | 27.35 | 24.71 |
| 1400. | 30.75 | 48.61 | 28.79 | 27.75 |
| 1500. | 31.36 | 50.75 | 30.18 | 30.86 |
| 1600. | 31.91 | 52.79 | 31.53 | 34.02 |
| 1700. | 32.39 | 54.74 | 32.84 | 37.23 |
| 1800. | 32.83 | 56.61 | 34.11 | 40.50 |
| 1900. | 33.23 | 58.39 | 35.34 | 43.80 |
| 2000. | 33.60 | 60.11 | 36.53 | 47.14 |
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
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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