Sublimation enthalpy of tellurium tetrabromide by the torsion effusion method

Abstract

The total vapour pressure of TeBr 4(s) was measured in the temperature range 423–485 K by the torsion effusion method. The total pressure as a function of temperature can be represented by the following equation: log( p/ kPa)=(11.17 ± 0.20) − (6104 ± 100)(K/T) The equilibrium involved in the vaporation process is described by: ( x + y)TeBr 4(s) → xTeBr 4(g) + yTeBr 2(g) + yBr 2(g) where x = 0.06 and y = 0.47. The reaction enthalpy ΔH 0(298) = 119 ± 4 kJ mol −1 was obtained from the second and third law treatment of the data.