Determination of saturated organic vapour concentrations by a spectroscopic method

A spectroscopic method for determination of organic saturated vapour concentrations is presented. From absorption spectra, an empirical equation is established relating absorbance with the temperatures of the cell and its side arm. Application to determination of benzene vapour concentrations, as well as the heat of vaporization referred to 0 K is described: the value 47.90 ± 0.03 kJ mol⁻ was obtained.