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 (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 2000. |
|---|---|
| A | 45.96626 |
| B | 102.5729 |
| C | -38.90463 |
| D | 5.642040 |
| E | -0.252315 |
| F | -123.8050 |
| G | 77.20610 |
| H | -105.0180 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1965 |
| Temperature (K) |
Cp (J/mol*K) |
S° (J/mol*K) |
-(G° - H°298.15)/T (J/mol*K) |
H° - H°298.15 (kJ/mol) |
|---|---|---|---|---|
| 298. | 70.39 | 51.87 | 51.93 | -0.02 |
| 300. | 70.59 | 52.34 | 51.93 | 0.12 |
| 400. | 79.55 | 73.91 | 54.81 | 7.64 |
| 500. | 87.22 | 92.51 | 60.53 | 15.99 |
| 600. | 94.02 | 109.0 | 67.26 | 25.06 |
| 700. | 100.1 | 124.0 | 74.31 | 34.77 |
| 800. | 105.6 | 137.7 | 81.39 | 45.06 |
| 900. | 110.6 | 150.4 | 88.36 | 55.88 |
| 1000. | 115.0 | 162.3 | 95.17 | 67.16 |
| 1100. | 119.0 | 173.5 | 101.8 | 78.87 |
| 1200. | 122.6 | 184.0 | 108.2 | 90.95 |
| 1300. | 125.8 | 193.9 | 114.4 | 103.4 |
| 1400. | 128.7 | 203.4 | 120.4 | 116.1 |
| 1500. | 131.2 | 212.3 | 126.3 | 129.1 |
| 1600. | 133.5 | 220.9 | 131.9 | 142.3 |
| 1700. | 135.5 | 229.0 | 137.4 | 155.8 |
| 1800. | 137.4 | 236.8 | 142.7 | 169.4 |
| 1900. | 139.0 | 244.3 | 147.9 | 183.3 |
| 2000. | 140.6 | 251.5 | 152.9 | 197.2 |
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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