Abstract
We report a novel formulation representation of the molar Gibbs free energy for sulfur dioxide (SO2), which depends only on experimental values of six molecular constants of SO2, whereas the conventional explicit representations contain many adjustable coefficients determined from fitting a great number of experimental spectroscopic data or calorimetric data. The formulation representation of the molar entropy for SO2 is also developed from the Gibbs free energy representation. The predicted reduced molar Gibbs free energy and entropy values yield the average absolute deviations of 0.0750 % and 0.228 % from the data reported in the National Institute of Standards and Technology database at the pressure of 0.1 MPa and in the temperature range from 298 to 6000 K, respectively. The proposed formulation representation of the Gibbs free energy for SO2 can be valuable in practical engineering applications.
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