The temperature dependence of the total vapor pressure of GaBr3 measured by the torsion-effusion method over the temperature range (300 to 357) K is represented by the following equation: log(p/Pa) ) (16.1 ( 0.6) - (5250 ( 200)(K/T). This compound sublimes to the monomer and dimer species. From the temperature dependence of the dissociation, and the equilibrium constant of the dimer found in the literature, the partial pressures of both forms were evaluated from which the second- and third-law standard enthalpies of the sublimation reactions, GaBr3(s) ) GaBr3(g) and GaBr3(s) ) 1/2Ga2Br6(g), were calculated: AsubHdeg (298 K) ) (92.5 ( 2.0) kJ * mol-1 and (50.5 ( 2.0) kJ * mol-1 for the monomer and dimer forms, respectively.
Compounds
#
Formula
Name
1
Br3Ga
gallium bromide
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.