Abstract
The vapour pressure differences between a mixture of (propane + cyclopropane) and cyclopropane and between propane and cyclopropane have been measured simultaneously with the absolute vapour pressure of cyclopropane. This was done at 13 temperatures between 175 K and 210 K, as a function of composition. The mixtures show small positive deviations from Raoult's law. The excess molar Gibbs energy ( G m E) has been calculated from the vapour pressure data fitted to the equation G m E/( RTx 1 x 2 = (−0.2490±0.0072)+(81.8±1.4)/T. The estimated value of the excess molar enthalpy ( H m E) for the equimolar composition, in the same temperature range is 170 ± 4 J mol −1. The results were interpreted using Deiters' equation of state.
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