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

VI.2 Sn 2+ 97
Figures A-37 to A-40. As predicted by [1996PLY/GRE] the difference between
Vasil’ev and SIT values is not large but perceptible.
ο
The calculation of Δ f H m (Sn 2+ , 298.15 K) from thermochemical data of
[1973VAS/KOK], [1973VAS/VAS2], [1973VAS/VAS] and [1976VAS/KOK] as well
as NEA-TDB auxiliary data is summarised in Table VI-5. For the re-evaluation of
Vasil’ev et al.’s the uncertainty was set to 4σ (see also Figures A-37 and A-40).
Consequently the SIT value appears to be less precise than that obtained by the authors’
method [1967VAS], [1978VAS/YAS]. With the values of the enthalpies of Reactions
(VI.16) and (VI.19) recalculated in this review (see Table VI-4), the values of
ο
Δ fHm
(Sn 2+ , 298.15 K) derived from Δ r H (VI.16) and Δ r H (VI.19) agree with each
other perfectly, thus the corresponding mean value was selected.
Table VI-5: Calculation of
Δ
f
H
ο
m
(Sn 2+ , 298.15 K) from thermochemical data.
o
o
o −
[ Δ H (SnCl ) + Δ H (SnCl , cr) − 2 Δ H (Cl ) =
diss m 2
f m 2
f
m
Δ
(Sn )]/kJ·mol
H o 2+ −1
f m
[1976VAS/KOK] − (13.81 ± 1.00) − (327.86 ± 1.09) − (167.08 ± 0.10)×2 − (7.51 ± 1.49)
[1976VAS/KOK]
recalc. using SIT − (15.05 ± 0.93) − (328.01 ± 2.08) − (167.08 ± 0.10)×2 − (8.90 ± 2.29)
[1973VAS/VAS],
[1973VAS/VAS2],
[1976VAS/KOK],
recalc. this review − (15.83 ± 0.20) − (327.9 ± 2.2) − (167.08 ± 0.10)×2 − (9.57 ± 2.22)
o
o
o −
[ Δ H (SnCl ) + Δ H (SnCl ·2H O, cr) − 2 Δ H (Cl ) − 2 Δ H
o (H O, l) = Δ
diss m 2
f m 2 2
f
m
f m 2
(Sn )]/kJ·mol
H o 2+ −1
f m
[1976VAS/KOK] (4.40 ± 0.45) − (918.26 ± 1.42) − (167.08 ± 0.10)×2 − (285.83 ± 0.04)×2 − (8.04 ± 1.50)
[1976VAS/KOK]
recalc. using SIT (3.19 ± 0.43) − (918.95 ± 2.74) − (167.08 ± 0.10)×2 − (285.83 ± 0.04)×2 − (9.94 ± 2.78)
[1973VAS/VAS],
[1973VAS/VAS2],
[1976VAS/KOK],
recalc. this review (3.01 ± 0.14) − (918.26 ± 2.75) − (167.08 ± 0.10)×2 − (285.83 ± 0.04)×2 − (9.43 ± 2.76)
o 2
[1976VAS/KOK] recalc. SIT → H + −1
Δ (Sn )/kJ·mol this review, all data → Δ
f m
(Sn )/kJ·mol
H o 2+ −1
f m
Eq. (VI.16) − (8.90 ± 2.29) Eq. (VI.16) − (9.57 ± 2.22)
Eq. (VI.19) − (9.94 ± 2.78) Eq. (VI.19) − (9.43 ± 2.76)
weighted mean − (9.32 ± 1.77) weighted mean − (9.52 ± 1.73)
Vasil’ev and Glavina [1973VAS/GLA]:
SIT [1976VAS/KOK]:
f
ο
m
Δ H (Sn 2+ , 298.15 K) = − (12.6 ± 3.3) kJ·mol –1
f
ο
m
Δ H (Sn 2+ , 298.15 K) = − (9.3 ± 1.8) kJ·mol –1
Vasil’ev et al.’s data [1973VAS/VAS], [1973VAS/VAS2], [1976VAS/KOK] recalculated
ο
by this review:
Δ H (Sn 2+ , 298.15 K) = − (9.5 ± 1.7) kJ·mol –1 .
f
m
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012