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

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VII Tin oxygen and hydrogen compounds and complexes
VII.3 Gaseous tin hydrides
VII.3.1
SnH 4 (g)
Tin tetrahydride, or stannane SnH 4 , is a gas under ambient conditions; the normal
boiling point is 221.4 K [1952ROS/WAG]. Experimental data to 1964 for formation
properties of stannane were reviewed by [1964JEF/MCK].
The ideal gas heat capacity of stannane may be deduced from spectroscopic
data. Such data are given in [1961MAY/DIL], [1965LEV/ZIF], [1966WIL/WIL] and
[1964DEV/YUS]. The model chosen for calculations is generally the harmonic
oscillator-rigid rotator approximation. The results of original calculations and
compilations/ evaluations are given in Table VII-7. The compilations [1952ROS/WAG]
and [1982WAG/EVA] both give a value (at 298 K only) of 48.95 J·K –1·mol –1 without
discussion or stating source. The tabulated data of [1977BAR/KNA] and [1993BAR]
were taken from [1962GLU] and/or [1970GLU] (the exact source is not clear). The only
fitting equation available was given by [1977BAR/KNA]:
ο
C p,m
(SnH 4 , g, T )/J·K –1·mol –1 = 51.80 + 0.03766 T/K − 1.130 × 10 6 (T/K) –2 (VII.27)
and no uncertainty was given. Values from this equation are included in Table VII-7.
Table VII-7: The heat capacity of stannane ideal gas from spectroscopic data (a) .
T/K C ο –1
p,m
(SnH 4 , g, T )/J·K
–1·mol
Original calculations Compilations Tabulated
[1961MAY/DIL] [1969SHA/MOR] [1993BAR] [1977BAR/KNA] Eq. (VII.27)
221 41.1
273 46.48 46.92
298.15 49.08 50.59 50.585 50.317 50.32
300 50.75 50.810 50.543 50.88
373 56.90 57.73
400 59.79 60.068 59.798 59.80
423 60.42 61.41
500 67.24 66.375 66.11
600 73.51 71.521 71.254 71.26
(a) The number of significant figures shown are those of the experimenter/evaluator.
The standard entropy of the ideal gas was calculated from molecular constants.
The results of original calculations and values from compilations are given in
Table VII-8. The tabulated data of [1977BAR/KNA] and [1993BAR] were taken from
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012