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• We present an efficient closed-form representation of molar Gibbs free energy for gaseous substances. • Present molar Gibbs free energy calculation model only involves three molecular constants. • We excellently predict molar Gibbs free energy values for the gases Cl 2 , Br 2 , and HCl. We develop a new closed-form representation for the molar Gibbs free energies of gaseous substances. The predicted molar Gibbs free energies are in excellent agreement with the experimental data in a wide temperature range for three gases under consideration, and the average absolute deviations of the predicted results from the experimental data are 0.06155%, 0.0708% and 0.16696% for the gases Cl 2 , Br 2 , and HCl, respectively. The proposed model is away from the need of a large amount of experimental spectroscopy data, and only related to the dissociation energy, equilibrium bond length, and equilibrium vibration frequency. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • We present an efficient closed-form representation of molar enthalpy for gaseous substances. • Present molar enthalpy calculation model only involves four molecular constants. • We excellently predict molar enthalpy values for the CO, HCl, and BF gases. Abstract We present a universal efficient closed-form representation for the molar enthalpy of gaseous substances. The predicted molar enthalpy values show excellent agreements compared to the experimental data in a wide temperature range for the gases CO, HCl, and BF. The proposed model is away from the need of plenty of experimental spectroscopy data, and depends on only four molecular constants, for which the experimental values can be easily found in the literature. [ABSTRACT FROM AUTHOR]