Magnesium chloride
- Formula: ClMg
- Molecular weight: 59.758
- IUPAC Standard InChI: InChI=1S/ClH.Mg/h1H;/q;+1/p-1
- IUPAC Standard InChIKey: FOSCDBCOYQJHPN-UHFFFAOYSA-M
- CAS Registry Number: 14989-29-8
- Chemical structure:
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Gas phase thermochemistry data
Go To: Top, Constants of diatomic molecules, 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 | -10.40 | kcal/mol | Review | Chase, 1998 | Data last reviewed in March, 1966 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 55.784 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1966 |
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 6000. |
|---|---|
| A | 8.876631 |
| B | 0.168826 |
| C | -0.015187 |
| D | 0.001296 |
| E | -0.054469 |
| F | -13.23670 |
| G | 66.17070 |
| H | -10.40010 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in March, 1966 |
Constants of diatomic molecules
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 compiled by: Klaus P. Huber and Gerhard H. Herzberg
Data collected through March, 1977
| Symbol | Meaning |
|---|---|
| State | electronic state and / or symmetry symbol |
| Te | minimum electronic energy (cm-1) |
| ωe | vibrational constant – first term (cm-1) |
| ωexe | vibrational constant – second term (cm-1) |
| ωeye | vibrational constant – third term (cm-1) |
| Be | rotational constant in equilibrium position (cm-1) |
| αe | rotational constant – first term (cm-1) |
| γe | rotation-vibration interaction constant (cm-1) |
| De | centrifugal distortion constant (cm-1) |
| βe | rotational constant – first term, centrifugal force (cm-1) |
| re | internuclear distance (Å) |
| Trans. | observed transition(s) corresponding to electronic state |
| ν00 | position of 0-0 band (units noted in table) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fragments of four band systems at 12700 Querbach, 1930, 25900 Parker, 1935, 37060 and 40850 cm-1 [ Harrington, 1942, abs.]. | ||||||||||||
| B 2Σ | 47630 | [552.0] H | B → A V | 21136.8 H | ||||||||
| ↳Rao and Rao, 1963 | ||||||||||||
| 21191.9 1 H | ||||||||||||
| ↳Rao and Rao, 1963 | ||||||||||||
| A 2Π (1/2) | 26523.4 | 491.6 H | 2.54 | -0.025 | [0.25116] | (0.0018) | 0.225E-6 | [2.1720] | A ↔ X 2 V | 26535.89 Z | ||
| ↳Morgan, 1936; Morgan and Barrow, 1961 | ||||||||||||
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
| A 2Π (3/2) | 26469.4 | [0.24914] 3 | (0.0018) | 0.225E-6 | [2.1808] | A ↔ X 2 V | 26481.95 Z | |||||
| ↳Morgan, 1936; Morgan and Barrow, 1961 | ||||||||||||
| X 2Σ+ | 0 | [462.12] Z | 2.10 | 0.24502 | 0.00158 | 0.252E-6 | 2.1991 | |||||
Notes
| 1 | No clear identification of the various isotopic band heads was possible. |
| 2 | The assignment of the emission band heads by Parker, 1935, is not correct. |
| 3 | From Morgan and Barrow, 1961. Somewhat different results in Patel and Patel, 1968. |
| 4 | Thermochemical value (mass-spectrometry); average of three reactions Hildenbrand, 1970, Farber and Srivastava, 1976. |
References
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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]
Querbach, 1930
Querbach, J.,
Uber die spektra von Fe, La, Ca, Ba, Sr, Mg und ihrer verbindungen im nahen ultrarot,
Z. Phys., 1930, 60, 109. [all data]
Parker, 1935
Parker, A.E.,
Band systems of MgCl, CaCl, and SrCl,
Phys. Rev., 1935, 47, 349. [all data]
Harrington, 1942
Harrington,
Dissertation, University of California, California, 1942, 0. [all data]
Rao and Rao, 1963
Rao, V.S.; Rao, P.T.,
Emission spectrum of MgCl: a new doublet system,
Indian J. Phys., 1963, 37, 640. [all data]
Morgan, 1936
Morgan, F.,
Band spectra of MgCl, MgBr and MgI in absorption,
Phys. Rev., 1936, 50, 603. [all data]
Morgan and Barrow, 1961
Morgan, E.; Barrow, R.F.,
Rotational analysis of the A2Π-X2Σ+ system of MgCl,
Nature (London), 1961, 192, 1182. [all data]
Patel and Patel, 1968
Patel, M.M.; Patel, P.D.,
2Π1/2 rotational analysis of the A2Π1/2 → X2Σ+ system of the MgCl molecule,
Indian J. Phys., 1968, 42, 254. [all data]
Hildenbrand, 1970
Hildenbrand, D.L.,
Dissociation energies and chemical bonding in the alkaline-earth chlorides from mass spectrometric studies,
J. Chem. Phys., 1970, 52, 5751. [all data]
Farber and Srivastava, 1976
Farber, M.; Srivastava, R.D.,
The dissociation energy of magnesium chloride,
Chem. Phys. Lett., 1976, 42, 567. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, 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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