calcium
- Formula: Ca
- Molecular weight: 40.078
- IUPAC Standard InChIKey: OYPRJOBELJOOCE-UHFFFAOYSA-N
- CAS Registry Number: 7440-70-2
- 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:
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- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, 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 | 177.8 ± 0.8 | kJ/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 177.80 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 154.887 ± 0.004 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 154.89 | J/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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 1774. to 6000. |
---|---|
A | 121.5470 |
B | -74.95390 |
C | 19.17230 |
D | -1.400821 |
E | -64.51340 |
F | 42.23540 |
G | 217.4470 |
H | 177.8000 |
Reference | Chase, 1998 |
Comment | Data last reviewed in September, 1983 |
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°liquid | 7.79 | kJ/mol | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 45.51 | J/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1983 |
Quantity | Value | Units | Method | Reference | Comment |
S°solid,1 bar | 41.59 ± 0.40 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 1115. to 1773.658 |
---|---|
A | 35.00004 |
B | 1.119602×10-10 |
C | -8.292981×10-11 |
D | 1.878880×10-11 |
E | 1.912569×10-12 |
F | -2.646946 |
G | 87.86609 |
H | 7.788015 |
Reference | Chase, 1998 |
Comment | Data last reviewed in September, 1983 |
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 (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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Temperature (K) | 298. to 1100. | 298. to 716. | 716. to 1115. |
---|---|---|---|
A | 19.77517 | 11.11735 | -40.63785 |
B | 10.10813 | 38.52364 | 126.7765 |
C | 14.50338 | -8.891419 | -69.73891 |
D | -5.529491 | -9.618305 | 17.93162 |
E | 0.178031 | 0.391850 | 5.409494 |
F | -5.862997 | -2.563503 | 24.49192 |
G | 62.91606 | 47.71852 | -15.67297 |
H | 0.000000 | 1.056001 | 1.056001 |
Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
Comment | α phase; Data last reviewed in September, 1983 | β phase; Data last reviewed in September, 1983 | β phase; Data last reviewed in September, 1983 |
Phase change 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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 1757. | K | N/A | Honig and Kramer, 1969 | Uncertainty assigned by TRC = 2. K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 1112.9 | K | N/A | Honig and Kramer, 1969 | Uncertainty assigned by TRC = 2. K; TRC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
1254. to 1712. | 2.78473 | 3121.368 | -594.591 | Hartmann and Schneider, 1929 | Coefficents calculated by NIST from author's data. |
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
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
(CAS Reg. No. 56977-48-1 • 4294967295) +
= CAS Reg. No. 56977-48-1
By formula: (CAS Reg. No. 56977-48-1 • 4294967295Ca) + Ca = CAS Reg. No. 56977-48-1
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 183. ± 6.3 | kJ/mol | N/A | Rackwitz, Feldman, et al., 1977 | gas phase |
References
Go To: Top, Gas phase thermochemistry data, Condensed 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]
Hartmann and Schneider, 1929
Hartmann, H.; Schneider, R.,
Die Siedetemperaturen von Magnesium, Calcium, Strontium, Barium and Lithium,
Z. Anorg. Allg. Chem., 1929, 180, 1, 275-283, https://doi.org/10.1002/zaac.19291800129
. [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]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed 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) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid,1 bar Entropy of solid at standard conditions (1 bar) Tboil Boiling point Ttriple Triple point temperature ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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