Magnesium dimer
- Formula: Mg2
- Molecular weight: 48.6100
- IUPAC Standard InChI: InChI=1S/2Mg
- IUPAC Standard InChIKey: HZZOEADXZLYIHG-UHFFFAOYSA-N
- CAS Registry Number: 29904-79-8
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, 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°gas | 68.745 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 57.407 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1983 |
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) | 298. to 800. | 800. to 2000. | 2000. to 4000. | 4000. to 6000. |
|---|---|---|---|---|
| A | 5.129518 | 3.463385 | 163.2063 | -876.1759 |
| B | -0.586566 | 2.482696 | -113.0935 | 387.8848 |
| C | 0.764283 | -1.518289 | 28.62500 | -60.24570 |
| D | -0.344343 | 0.326733 | -2.287254 | 3.196631 |
| E | 0.070467 | 0.285968 | -113.3970 | 1587.345 |
| F | 67.47108 | 68.41157 | -146.6826 | 1973.150 |
| G | 64.15392 | 62.11042 | 115.0143 | 199.1150 |
| H | 68.74403 | 68.74403 | 68.74403 | 68.74403 |
| Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in September, 1983 | Data last reviewed in September, 1983 | Data last reviewed in September, 1983 | Data last reviewed in September, 1983 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated by: Edward P. Hunter and Sharon G. Lias
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Proton affinity (review) | 220. | kcal/mol | N/A | Hunter and Lias, 1998 | |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 211.9 | kcal/mol | N/A | Hunter and Lias, 1998 |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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