Thermodynamics of Cyclohexanone Oxime

The heat capacity of cyclohexanone oxime in the interval of (5 to 370) K was measured in an adiabatic calorimeter. The triple-point temperature T fus = (362.20 ± 0.04) K and the enthalpy of fusion Δ cr liq H m ° = (12454 ± 20) J·mol −1 were determined. The vapor pressure was measured by the Knudsen method over crystalline cyclohexanone oxime in the interval of (288 to 323) K and by the transpiration method over crystalline, T = (286 to 348) K, and liquid, T = (365 to 395) K, cyclohexanone oxime. Thermodynamic properties in the ideal-gas state were calculated based on the experimental molecular and spectral data and the results of DFT (B3LYP/6-311G(d)) calculations. The experimental and calculated values of the entropy of gaseous cyclohexanone oxime agree within 1 % in the interval of (310 to 362.2) K.