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

X.3 Arsenic compounds and complexes 243
T/K
ο
p,m
C /J·K –1·mol –1 HT ( ) − H(0K)/
Table X-6 (continued)
J·mol –1
ο
S m /J·K –1·mol –1 −[( GT ( ) − G(0 K)) T −1
] /
–1
J·K
–1·mol
260.00 50.2 (50.286) 9680 (9691.57) 81.0 (81.040) 43.0 (43.765)
273.15 50.6 (50.610) 10300 (10354.98) 83.5 (83.529) 44.8 (45.620)
290.00 51.0 (51.012) 11200 (11211.16) 86.5 (86.571) 47.1 (47.911)
298.15 51.2 (51.202) 11600 (11627.68) 88.0 (87.987) 48.2 (48.988)
310.00 51.5 (51.477) 12200 (12236.06) 90.0 (89.988) 50.0 (50.517)
Figure X-4: Heat capacity data of SnAs(cr) as measured by Koshchenko et al.
[1980KOS/PAS2]. The data can be fitted using the equations:
ο 40K
p,m 5K
[ C ]
ο 313K
p,m 40K
[ C ]
(SnAs, cr, T )/J·K –1·mol –1 = (61.44 ± 2.09)exp[−(49.17 ± 1.11)/(T/K)] and
(SnAs, cr, T )/J·K –1·mol –1 = − (6.399 ± 2.103) + (0.04747 ± 0.00187)(T/K)
– (9602 ± 227)/(T/K) + (94539 ± 2361)/(T/K) 2
+ (1288 ± 40)/(T/K) 0.5 .
50
40
–1·mol
–1
C° p,m
/J·K
30
20
exp. data [1980KOS/PAS2]
C° p,m
/J·K -1·mol –1 =
(61.44 ± 2.09) exp[–(49.17 ± 1.11)/(T/K)]
(61.94 ± 0.55) – (0.01227 ± 0.0014)(T/K) – (2234 ± 59)(K/T)
+ (18996 ± 1715)(K/T) 2
10
–(6.399 ± 2.103) + (0.04747 ± 0.00187)(T/K)
– (9602 ± 227)(K/T) + (94539 ± 2361)(K/T) 2
+ (1288 ± 40)(K/T) 0.5
0
0 100 200 300
T / K
The selected data are:
ο
–1
C p,m (SnAs, cr, 298.15 K) = (51.2 ± 0.26) J·K
–1·mol
ο
–1
S m (SnAs, cr, 298.15 K) = (88.0 ± 0.5) J·K
–1·mol
ο
Δ H (SnAs, cr, 298.15 K) = − (9.5 ± 3.2) kJ·mol –1 .
f
m
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012