magnesium dihydride


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
Δfsolid-18.20kcal/molReviewChase, 1998Data last reviewed in September, 1963
Quantity Value Units Method Reference Comment
solid7.416cal/mol*KReviewChase, 1998Data last reviewed in September, 1963

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 2000.
A 3.180321
B 24.65600
C -14.42830
D 2.911011
E -0.079568
F -20.39400
G 4.082300
H -18.20010
ReferenceChase, 1998
Comment Data last reviewed in September, 1963

Reaction 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.

Data compiled by: John E. Bartmess

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Individual Reactions

HMg- + Hydrogen cation = magnesium dihydride

By formula: HMg- + H+ = H2Mg

Quantity Value Units Method Reference Comment
Δr359.3 ± 2.4kcal/molD-EARackwitz, Feldman, et al., 1977gas phase; Caln: ΔHacid=363.8 Hinde, 2000

Gas phase ion energetics 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.

Data compiled by: John E. Bartmess

De-protonation reactions

HMg- + Hydrogen cation = magnesium dihydride

By formula: HMg- + H+ = H2Mg

Quantity Value Units Method Reference Comment
Δr359.3 ± 2.4kcal/molD-EARackwitz, Feldman, et al., 1977gas phase; Caln: ΔHacid=363.8 Hinde, 2000

References

Go To: Top, Condensed phase thermochemistry data, Reaction 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]

Rackwitz, Feldman, et al., 1977
Rackwitz, R.; Feldman, D.; Kaiser, H.J.; Heincke, E., Photodetachment bei einigen zweiatomigen negativen hydridionen: BeH-, MgH-, CaH-, ZnH-, PH-, AsH-, Z. Naturforsch. A:, 1977, 32, 594. [all data]

Hinde, 2000
Hinde, R.J., Ab initio gas-phase acidities of NaH, MgH2, and AlH3, J. Phys. Chem. A, 2000, 104, 32, 7580-7585, https://doi.org/10.1021/jp994138j . [all data]


Notes

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