magnesium hydroxide
- Formula: H2MgO2
- Molecular weight: 58.3197
- CAS Registry Number: 1309-42-8
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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 | -136.80 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 63.877 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1975 |
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 1800. | 1800. to 6000. |
|---|---|---|
| A | 19.23200 | 23.26770 |
| B | 3.111932 | 1.135970 |
| C | -0.139038 | -0.191042 |
| D | -0.100458 | 0.011410 |
| E | -0.316364 | -3.486062 |
| F | -143.7330 | -149.7490 |
| G | 84.44909 | 85.01190 |
| H | -136.8000 | -136.8000 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in December, 1975 | Data last reviewed in December, 1975 |
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°solid | -221.00 | kcal/mol | Review | Chase, 1998 | Data last reviewed in December, 1975 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid | 15.10 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in December, 1975 |
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. to 1000. |
|---|---|
| A | 20.29240 |
| B | 17.79160 |
| C | -16.47420 |
| D | 6.365302 |
| E | -0.519815 |
| F | -229.4560 |
| G | 32.10490 |
| H | -221.0000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in December, 1975 |
Vibrational and/or electronic energy levels
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, NIST Free Links, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Marilyn E. Jacox
State: X
| Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
|---|---|---|---|---|---|---|---|
| OH stretch | 3829.8 | Ar | IR | Andrews and Wang, 2005 Wang and Andrews, 2005 | |||
| OH stretch | 3815.4 | H2 | IR | Wang and Andrews, 2005 | |||
| MgO a-stretch | 867.2 | Ar | IR | Tague and Andrews, 1994 Andrews and Wang, 2005 Wang and Andrews, 2005 | |||
| MgO a-stretch | 846.5 | H2 | IR | Wang and Andrews, 2005 | |||
Additional references: Jacox, 1998, page 282
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Vibrational and/or electronic energy levels, NIST Free Links, 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]
Andrews and Wang, 2005
Andrews, L.; Wang, X.,
Infrared Spectra of the Group 2 Metal Dihydroxide Molecules,
Inorg. Chem., 2005, 44, 1, 11, https://doi.org/10.1021/ic0483794
. [all data]
Wang and Andrews, 2005
Wang, X.; Andrews, L.,
Infrared Spectra and Electronic Structure Calculations for the Group 2 Metal M(OH),
J. Phys. Chem. A, 2005, 109, 12, 2782, https://doi.org/10.1021/jp044660s
. [all data]
Tague and Andrews, 1994
Tague, T.J., Jr.; Andrews, L.,
Pulsed Laser Evaporated Magnesium Atom Reactions with Hydrogen: Infrared Spectra of Five Magnesium Hydride Molecules,
J. Phys. Chem., 1994, 98, 35, 8611, https://doi.org/10.1021/j100086a004
. [all data]
Jacox, 1998
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules: supplement A,
J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017
. [all data]
Notes
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- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°solid Entropy of solid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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