Contributions to the Data on Theoretical Metallurgy: [Part] 7. The Thermodynamic Properties of Sulphur and its Inorganic Compounds Page: 59
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:
THERMODYNAMIC PROPERTIES OF SULPHUR 59
The resulting heat and free-energy equations follow:
RuS2= Ru + S2(g);
AH= 79,500- 5 T, (335)
AF = 79,500+ 11.5T log T-82.22 T, (336)
AH298.1= 78,010; AF029s.1= 63,470.
Combination of equations (20), (21), (335), and (336) gives the
following results:
Ru + 2S(rh) = RuS2;
AHI= -48,140+5.59T-5.80X 10-3T2, (337)
AF= -48,140-12.87T log T+5.80X 10-3T2+43.60 T, (338)
AH28s.1= -46,990; AF298.1= -44,110.
SILVER SULPHIDE
At least two modifications of Ag2S are known, one stable below
448, here designated as AgS(a), and the other stable above 448,
Ag2S(3). From the available heat-content data, which are rather
meager, the following results were tabulated previously (67):
Ag2S(a): C= 18.8(273-448), (339)
Ag2S(a) = Ag2S(), AH4s= 1,040;
Ag2S(j): C= 21.8(448-5970). (340)
Also for Ag (67),
Ag: C,= 5.60+ 1.50X 10-3T. (341)
Recently, Zeumer and Roth (176) have determined the heat of
formation of Ag2S(a) as AH293 1= -6,600200. Correcting to 298.10,
although the correction is negligible in comparison with the probable
error, AH298.1= -6,580 is obtained. This heat-of-formation figure
is adopted and will be employed, in conjunction with the equilibria
in the reduction of Ag2S by H,2, to compute the free energy of forma-
tion.
The reaction Ag2S()+H2=2Ag+H2S has been studied by Jellinek
and Zakowski (57), Watanabe (163), and Keyes and Felsing (73).
Data for the corresponding reaction at temperatures above the melt-
ing point of Ag were obtained by Britzke and Kapustinsky (12) and
also by Jellinek and Zakowski. The present calculations will be
confined to the region in which Ag (s) is formed. From information
already presented there may be written
Ag2S(a) + H2=2Ag -- H2S,
AC= -7.07+5.51X 10-3T, (342)
AH=-AHo-7.07 T+2.76X 10-3T2, (943)
iAFo=Ho+16.28 T log T-2.76X 10-3 T2 I T; (344)
and
AgS(0) + H2,= 2Ag+ H2S,AC, = -10.07+5.51X 10-3T,
(345)
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/m1/61/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.