Chemical Thermodynamics of Tin - Volume 12 - OECD Nuclear ...

VIII.4 Gaseous halides
203
SnBr 4 [1991GUR/VEY]. The selected value was chosen from the more concordant data
in Table VIII-27:
sub
ο
m
Δ H (SnBr 4 , cr, 298.15 K) = (63.8 ± 1.5) kJ·mol –1 .
Hence from these two data
f
ο
m
Δ H (SnBr 4 , g, 298.15 K) = − (324.2 ± 4.5) kJ·mol –1 .
Table VIII-27: Enthalpy of sublimation of SnBr 4 as determined from vapour pressure
measurements.
Reference Method T/K Number
of data
sub
ο
m
Δ H (SnBr 4 , cr, 298.15 K)/kJ·mol –1
2 nd Law 3 rd Law
[1951KAB/NYH] Static 313-473 23 60.7 ± 1.1 63.4 ± 1.9
[1960KEA/SMI] Static 280-301 12 62.5 ± 1.7 64.1 ± 1.0
[1960KEA/SMI] Static 304-315 6 64.5 ± 1.9 64.0 ± 1.3
[1977TIT/STE] Static 312-475 (a) 68.6 62.6 ± 2.0
(a) Data in equation form only.
Other selected data are
which leads to:
ο
–1
C p,m (SnBr 4 , g, 298.15 K) = (103.3 ± 0.2) J·K
–1·mol
ο
S m (SnBr 4 , g, 298.15 K) = 413.2 ± 0.1) J·K –1·mol –1 ,
Δ G (SnBr 4 , g, 298.15 K) = − (341.4 ± 4.5) kJ·mol –1 .
f
ο
m
VIII.4.4 Gaseous iodides
VIII.4.4.1 SnI 2 (g)
Ideal gas properties of gaseous SnI 2 were calculated by [1963BRE/SOM] and
[1991GUR/VEY] from spectroscopic and structural data. The data were those of
[1964CHA/DYA], [1983DEM/HER], [1958AKI/SPI], [1970BEA/PER] and
[1969ZOL/FRO]. Gurvich and Veyts [1991GUR/VEY] re-evaluated the data and
performed the calculations using the rigid rotator-harmonic oscillator approximation.
Reported data appear in Table VIII-28.
The standard enthalpy of formation of gaseous SnI 2 may be derived from data
for the condensed compound. The enthalpy of sublimation of the solid may be derived
from vapour pressure measurements; Table VIII-29 summarises data sources. The same
property was determined by other methods (Table VIII-30). The enthalpy of
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012