Contributions to the Data on Theoretical Metallurgy: [Part] 7. The Thermodynamic Properties of Sulphur and its Inorganic Compounds Page: 14
ii, 154 p. : tables ; 24 cm.View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
14 DATA ON THEORETICAL METALLURGY.-VII
For the free energy of SO2(aq.) from the elements, therefore, AF298s.1
-71,870 is obtained.
Following the convention of Lewis and Randall (88) there may be
written AF298.1-0 for the reaction SO2 (aq.) +H20 (1)= H2S03 (aq.).
The free energy of formation of H20(1) has been obtained as AFO298.1-
-56,720 (71). Consequently, the free energy of formation of H2SO3(aq.)
from the elements is AF298.1= -128,590.
The reaction H2SO3(aq.)=H+(aq.)+HS03-(aq.) also was con-
sidered by Johnstone and Leppla who found AH- --3,860 and
AF298.1=-2,725, corresponding to
H2SO (aq.) = H+(aq.) + HSO3- (aq.),
AF - 3,860+22.09 T. (55)
As the free energy of formation of H+(aq.) is zero, it follows that the
free energy of formation of HSO3-(aq.) is AF268.1=- 125,870.
Jellinek (53) has obtained K2 = 5 X 10-6 approxime nly as the second
dissociation constant of H2SO3(aq.), corresponding o the reaction
HSO,-(aq.)= H+(aq.)- SO3- - (aq.). As AF= - R T' In K, it follows
that the free energy of this reaction is AF 298.1= 7,240 and the free
energy of formation of SO3- - (aq.) is AF298.1= -118,630.
SULPHUR TRIOXIDE
Reaction 2S02(g) + 02=2SO3(g) .-Bodenstein and Pohl (7) and
Taylor and Lehner (154) have determined equilibria in the reaction
2SO2(g)+02-2SO3(g). As the specific heat of S03(g) is not known,
AC,- -2 is chosen arbitrarily for this reaction and there may be
written
2SO2 (g) + -02= 2S03(g);
AH= AHo- 2 T, (56)
AF-AHo+4.61 Tlog T+I T, (57)
2= --R In K-4.61 log T= ,1,+I. (58)
The calculations of I are summarized in table 14.
TABLE 14.--- SO,(g) +02 2S03 (g)
02so. 43,200
T K= o -R In K -4.61 log T 43,2. /
Aleasurernent of Bodendt in and Pohl
801 980 -13. 686 -13.386 -27.07 53.93 26. 86
852 189 -10. 415 -13.509 -23.92 50. 70 26. 78
900 42.7 -7.461 -13.619 -21.08 43.00 26.92
953 11. 4 -4. 833 -13. 734 -18. 57 45. 3: 26. 76
1,000 3. 66 -2. 453 -13. 830 -16. 38 43. 20 26. 92
1,062 .909 +. 189 -13.950 -13.76 40.63 26.92
1,105 .393 +1.852 -11. 0,0 -12. 18 39. 10 26. 92
1, 170 . 128 +4. 091 -14. 144 -10. 05 36. 92 26. 87
I Mean 26. 88
Measuremnl of Taylor and Lehner
933 17. 7 -5. 710 -13. 691 -19.40 46.30 26. 90
945 12. 1 -4.954 -13.717 -18. 67 45.71 27. 04
945 12. 7 -5. 050 -13. 717 - 18. 77 45. 71 26.94
943 12. 8 -5. 065 -13. 712 -18. 78 45.81 27. 03
936 15. 9 -5.496 -13. 698 -19. 19 46. 15 26. 96
Mean 26. 97
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 7. The Thermodynamic Properties of Sulphur and its Inorganic Compounds, report, 1937; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66396/m1/16/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.