sulphur trioxide

• Formula: O₃S
• Molecular weight: 80.063
• IUPAC Standard InChI: InChI=1S/O3S/c1-4(2)3 Copy

  
• IUPAC Standard InChIKey: AKEJUJNQAAGONA-UHFFFAOYSA-N Copy
• CAS Registry Number: 7446-11-9
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Other names: Sulfur trioxide
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• Information on this page:
  • Gas phase thermochemistry data
  • Phase change data
  • References
  • Notes
• Other data available:
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  • Henry's Law data
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  • Ion clustering data
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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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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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
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Enthalpy of fusion

References

Go To: Top, Gas phase thermochemistry data, Phase change 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]

Kondrat'ev and Strizhov, 1985
Kondrat'ev, S.N.; Strizhov, B.V., Zh. Fiz. Khim., 1985, 59, 2933. [all data]

Abercromby and Tiley, 1963
Abercromby, D.C.; Tiley, P.F., 937. The Condensed phases of sulphur trioxide. Part II. Vapour pressure of the liquid at temperatures up to the critical point, J. Chem. Soc., 1963, 4902, https://doi.org/10.1039/jr9630004902 . [all data]

Abercromby and Tiley, 1963, 2
Abercromby, D.C.; Tiley, P.F., The Condensed Phases of Sulphur Trioxide. Part II. Vapour Pressure of the Liquid at Temperatures up to the Critical Point, J. Chem. Soc., 1963, 4902-4904, https://doi.org/10.1039/jr9630004902 . [all data]

Kondrat'ev and Strizhov, 1989
Kondrat'ev, S.N.; Strizhov, B.V., Russ. J. Phys. Chem., 1989, 63, 656. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, References

• Symbols used in this document:
  

  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  Tfus	Fusion (melting) point
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfusH	Enthalpy of fusion
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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