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tantalum


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
Deltafgas186.90kcal/molReviewChase, 1998Data last reviewed in December, 1972
Quantity Value Units Method Reference Comment
gas,1 bar44.269cal/mol*KReviewChase, 1998Data last reviewed in December, 1972

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) 5778.07 - 6000.
A 7.058022
B 0.816251
C -0.135266
D 0.016659
E -1.177870
F 182.3070
G 49.63229
H 186.9000
ReferenceChase, 1998
Comment Data last reviewed in December, 1972

Condensed phase thermochemistry 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.

Quantity Value Units Method Reference Comment
Deltafliquid7.361kcal/molReviewChase, 1998Data last reviewed in December, 1972
Quantity Value Units Method Reference Comment
liquid,1 bar12.04cal/mol*KReviewChase, 1998Data last reviewed in December, 1972
Quantity Value Units Method Reference Comment
solid9.914cal/mol*KReviewChase, 1998Data last reviewed in December, 1972

Liquid 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) 3258. - 5778.07
A 10.00000
B 5.843191×10-9
C -1.155071×10-9
D 7.821650×10-11
E 1.253040×10-8
F -1.477771
G 17.46230
H 7.360189
ReferenceChase, 1998
Comment Data last reviewed in December, 1972

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. - 1300.1300. - 3258.
A 4.946181-10.48550
B 4.13478117.45240
C -3.749969-6.550660
D 1.3405110.957142
E 0.0147186.286841
F -1.57826114.38220
G 14.903306.144821
H 0.0000000.000000
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1972 Data last reviewed in December, 1972

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: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

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

(Ta+ bullet 2tantalum) + tantalum = (Ta+ bullet 3tantalum)

By formula: (Ta+ bullet 2Ta) + Ta = (Ta+ bullet 3Ta)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
177.8 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

(Ta+ bullet tantalum) + tantalum = (Ta+ bullet 2tantalum)

By formula: (Ta+ bullet Ta) + Ta = (Ta+ bullet 2Ta)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
153.9 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

Ta+ + tantalum = (Ta+ bullet tantalum)

By formula: Ta+ + Ta = (Ta+ bullet Ta)

Enthalpy of reaction

DeltarH° (kcal/mol) T (K) Method Reference Comment
159.2 CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, References