Carbon Dioxide - The NIST WebBook

Carbon dioxide

• Formula: CO2
• Molecular weight: 44.0095
• IUPAC Standard InChI: InChI=1S/CO2/c2-1-3 Copy
• IUPAC Standard InChIKey: CURLTUGMZLYLDI-UHFFFAOYSA-N Copy
• CAS Registry Number: 124-38-9
• Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file View 3d structure (requires JavaScript / HTML 5)
• Isotopologues:
  • Carbon dioxide (12C16O2)
• Other names: Carbon oxide (CO2); Carbonic acid, gas; Carbonic anhydride; Dry ice; CO2; Anhydride carbonique; Carbonica; Kohlendioxyd; Kohlensaure; UN 1013; UN 1845; UN 2187; Cardice; Dricold; Drikold; Carbonic acid anhydride; Khladon 744; R 744
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • References
  • Notes
• Other data available:
  • Phase change data
  • Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 100, reactions 101 to 143
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • Fluid Properties
• Data at other public NIST sites:
  • Electron-Impact Ionization Cross Sections (on physics web site)
  • Gas Phase Kinetics Database
  • Reference simulation: TraPPE Carbon Dioxide
  • X-ray Photoelectron Spectroscopy Database, version 5.0
• Options:
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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
ΔfH°gas	-393.51 ± 0.13	kJ/mol	Review	Cox, Wagman, et al., 1984	CODATA Review value
ΔfH°gas	-393.52	kJ/mol	Review	Chase, 1998	Data last reviewed in September, 1965
Quantity	Value	Units	Method	Reference	Comment
S°gas,1 bar	213.785 ± 0.010	J/mol*K	Review	Cox, Wagman, et al., 1984	CODATA Review value
S°gas,1 bar	213.79	J/mol*K	Review	Chase, 1998	Data last reviewed in September, 1965

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)	298. to 1200.	1200. to 6000.
A	24.99735	58.16639
B	55.18696	2.720074
C	-33.69137	-0.492289
D	7.948387	0.038844
E	-0.136638	-6.447293
F	-403.6075	-425.9186
G	228.2431	263.6125
H	-393.5224	-393.5224
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in September, 1965	Data last reviewed in September, 1965

References

Go To: Top, Gas phase 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]

Notes

Go To: Top, Gas phase thermochemistry data, 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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