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

VIII.4 Gaseous halides
201
was selected. The enthalpy of sublimation may be deduced from vapour pressure
measurements. The data sources are summarised in Table VIII-25. The enthalpy of
sublimation was derived from these data with the use of evaluated auxiliary data for
SnBr 2 [1991GUR/VEY].
Table VIII-24: Ideal gas properties of SnBr 2 from compilations/evaluations (C/E) and
original articles (A).
ο
p,m
S m
ο
Reference
C (SnBr 2 , g, 298.15 K)/ (SnBr 2 , g, 298.15 K)/
ο
Δ fHm
(SnBr 2 , g 298.15 K)/
–1
J·K
–1·mol
–1
J·K
–1·mol kJ·mol –1
[1999BIN/MIL] (C/E) 55.17 335.8 − 103.9
[1963BRE/SOM] (C/E) - - − 121
[1991GUR/VEY] (C/E) 56.39 (a) 329.041 (a) − 118.3 ± 4.3 (a)
[2004KOL/REF] (A) - 328.07 -
[1992BRU/WAL2] (A) 56.38 - -
(a) Selected data.
Table VIII-25: Determination of the enthalpy of sublimation of SnBr 2 from vapour
pressure measurements, neglecting dimerisation in the gas phase.
Reference Method T/K Number Δ subH
(SnBr 2 , cr, 298.15 K)/kJ·mol –1
of data
2 nd Law 3 rd Law
[1939FIS/GEW] Static Boiling point, (a) 139.3 ± 2.2 135.1 ± 2.0
< 893 K
[1969KAR2] Static 723-893 18 136.6 ± 1.8 134.2 ± 2.0
[1977TIT/STE] Static 581-888 (a) 130 134.6 ± 2.0
[1992BRU/WAL] Static 576-923 34 - 134.5 ± 3.0
(a) Data in equation form only.
ο
m
The more accurate third law results were favoured and the selected value is
sub
ο
m
Δ H (SnBr 2 , cr, 298.15 K) = (134.6 ± 2.0) kJ·mol –1 .
Hence from these two data
f
ο
m
Δ H (SnBr 2 , g, 298.15 K) = − (118.3 ± 4.3) kJ·mol –1 .
Other selected data are
ο
–1
C p,m (SnBr 2 , g, 298.15 K) = (56.4 ± 0.1) J·K
–1·mol
ο
S m (SnBr 2 , g, 298.15 K) = (329.0 ± 0.1) J·K –1·mol –1 .
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012