magnesium
- Formula: Mg
- Molecular weight: 24.3050
- IUPAC Standard InChIKey: FYYHWMGAXLPEAU-UHFFFAOYSA-N
- CAS Registry Number: 7439-95-4
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Other data available:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Computational Chemistry Comparison and Benchmark Database
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
- Options:
Data at NIST subscription sites:
NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.
Gas phase thermochemistry data
Go To: Top, Phase change data, Reaction thermochemistry 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 | 35.2 ± 0.2 | kcal/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 35.158 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 35.5277 ± 0.0007 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 35.528 | 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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 1366.104 to 2200. | 2200. to 6000. |
---|---|---|
A | 4.964881 | 11.37870 |
B | 0.008507 | -3.682780 |
C | -0.007628 | 0.687372 |
D | 0.002177 | -0.028873 |
E | 0.000110 | -6.457371 |
F | 33.67761 | 23.27920 |
G | 41.53439 | 42.35911 |
H | 35.15779 | 35.15779 |
Reference | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in September, 1983 | Data last reviewed in September, 1983 |
Phase change data
Go To: Top, Gas phase thermochemistry data, Reaction 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: Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 1363. | K | N/A | Honig and Kramer, 1969 | Uncertainty assigned by TRC = 1.5 K |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 922. | K | N/A | Honig and Kramer, 1969 | Uncertainty assigned by TRC = 0.6 K |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change 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: José A. Martinho Simões
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
(l) +
(cr) = C9H19BrMg (solution)
By formula: BrNO (l) + Mg (cr) = C9H19BrMg (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -55.2 ± 1.1 | kcal/mol | RSC | Holm, 1981 | solvent: Diethyl ether; Due to the possibility of side reactions, the enthalpy of reaction was not considered to be sufficiently reliable for deriving the enthalpy of formation of the Grignard reagent Holm, 1981 |
(l) +
(cr) = C7H7BrMg (solution)
By formula: C7H7Br (l) + Mg (cr) = C7H7BrMg (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -65.9 ± 1.1 | kcal/mol | RSC | Holm, 1981 | solvent: Diethyl ether; Due to the possibility of side reactions, the enthalpy of reaction was not considered to be sufficiently reliable for deriving the enthalpy of formation of the Grignard reagent Holm, 1981 |
(cr) +
(l) = CH3BrMg (solution)
By formula: Mg (cr) + CH3Br (l) = CH3BrMg (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -64.0 ± 1.1 | kcal/mol | RSC | Holm, 1981 | solvent: Diethyl ether; Due to the possibility of side reactions, the enthalpy of reaction was not considered to be sufficiently reliable for deriving the enthalpy of formation of the Grignard reagent Holm, 1981 |
(cr) +
(solution) = CH3IMg (solution)
By formula: Mg (cr) + CH3I (solution) = CH3IMg (solution)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -65.4 ± 0.2 | kcal/mol | RSC | Carson and Skinner, 1950 | solvent: Diethyl ether; It was assumed that MeI(l) has a negligible solution enthalpy in ether |
By formula: 2C5H6 (l) + Mg (cr) = C10H10Mg (cr) + H2 (g)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | -34.06 ± 0.69 | kcal/mol | RSC | Hull, Reid, et al., 1967 | Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970. |
References
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Honig and Kramer, 1969
Honig, R.E.; Kramer, D.A.,
Vapor pressure data for the solid and liquid elements,
RCA Rev., 1969, 1969, 285. [all data]
Holm, 1981
Holm, T.,
J. Chem. Soc., Perkin Trans. II, 1981, 464.. [all data]
Carson and Skinner, 1950
Carson, A.S.; Skinner, H.A.,
Nature, 1950, 165, 484. [all data]
Hull, Reid, et al., 1967
Hull, H.S.; Reid, A.F.; Turnbull, A.G.,
Inorg. Chem., 1967, 6, 805. [all data]
Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J.,
Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds
in Academic Press, New York, 1970. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) Tboil Boiling point Ttriple Triple point temperature ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.