The Thermodynamic Properties of Gaseous Sulfur Trioxide
- 1 October 1944
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 12 (10) , 408-412
- https://doi.org/10.1063/1.1723883
Abstract
The thermodynamic properties of sulfur trioxide in the ideal gas state are calculated from molecular data. To obtain satisfactory agreement with the equilibrium data for the reaction SO2+½O2=SO3, it is necessary to include vibrational anharmonicities, which are somewhat larger than usual because of an accidental degeneracy involving two of the normal frequencies. The standard entropy of SO3(g) at 25°C is 61.2±0.2 E.U., and its standard heat and free energy of formation from the elements are ΔH°298.16=−94.43±0.15 and ΔF°298.16=−88.48±0.20 kcal./mole.Keywords
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