The vapour pressure of benzoic acid

Abstract

Vapour pressures of benzoic acid were measured in the temperature range 316 to 391 K with a capacitance diaphragm manometer. The results were fitted to a three-parameter equation: R 1n(p/p °) = −δG °(θ)/θ+ δH(θ)(1/θ−1/T)+δC ° p(θ){θ/T−1 +1n(T/θ)} For the mean temperature θ = 353.15 K the thermodynamic-function changes are evaluated as: ΔG o(353.15 K) = −(10151±5) J · mol −1, ΔH o(353.15 K) = (89.45±0.05) kJ · mol −1, and ΔC p o(353.15 K) = −(48.4±5.0) J · K −1 · mol −1. A review of the literature data is given.