The thermodynamic properties: Cpo, So, Ho−H0o,−(Go−H0o)/T, ΔHfo, ΔGfo, and log Kf for chloroethane, 1,1‐dichloroethane, 1,1,1‐trichloroethane, 1,1,1,2‐tetrachloroethane, pentachloroethane, and hexachloroethane in the ideal gaseous state in the temperature range from 0 to 1500 K and at 1 atm were evaluated by statistical thermodynamic methods based on a rigid‐rotor harmonic‐oscillator model. The internal rotation contributions to thermodynamic functions were calculated by using a partition function formed by summation of internal rotation energy levels. The internal rotation barrier heights (in kcal mol‐1) employed for generation of the energy levels for each of the above six chloroethanes are: 3.69, 3.54, 5.08, 10.38, 14.43, and 14.7, respectively. The calculated heat capacities and entropies are compared with available experimental data. The derived values of Cpo, So, and ΔHfo at 298.15 and 700 K are compared with those reported in the other major compilations.

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