Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 96
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96 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
yield S28.20= 0.17 (extrapolation), S298.18-S28.20= 10.26, and S298.16=
The vibration frequency of the ZnO(g) molecule is 818 (212). The
interatomic distance is estimated here as 1.8 X 10-s cm., corresponding
to 1=69 X 10-40. There are computed S +7,298-.16=53.49, S ,298.10=
0.19, and S98.,16=53.70.5 for ZnO(g).
Sulfide.-Clusius and Harteck (100) (180-1970) and Giinther (204)
(210-590) measured the heat capacity of ZnS(c). Employing only the
data of the first-named investigators, there are calculated S17.80=0.09
(extrapolation), S298 .18-S17.s- 13.68 (measured), and S89s.1-= 13.8
Bromides.-Ishikawa and Yoshida (224) obtained AF98s.16= -31,442
and AH298.16= -29,530 for the reaction Zn(c) +2HgBr(c) =ZnBr2(c) +
2Hg(l). The entropy of reaction is AS~,s.6= 6.41, which, in turn, leads
to S~,9s.1632.5J.0 for ZnBr2(c). More recently, Bates (40), from
cell measurements and thermal data, reported S98s.16=32.95. The
mean, S2)s.16= 32.7 1.0, is adopted.
Stevenson (467) has suggested molecular constants for the ZnBr(g)
molecule, which correspond to 1= 308 X 10-40 and w- 330. The quan-
tum weight of the ground state is 2. There are computed St+r,298.16-
58.20, S,298.16= 1.26, S,298.16=1.38, and Sz,9s.,160.8 0.5.
Chlorides.-Elliott and Yost (142) have given the heat and free
energy of formation of ZnC12(c) as AH 98.16= -99,550 and AF298.16=
-87,990. The entropy of formation is ASs.16-= -38.8, and the cor-
responding entropy of ZnCl2(c) is S98s.16=24.5.
Ishikawa, Kimura, and Murooka (225) have studied the reaction
Zn(c) +2HgCl(c)-ZnCl_(c)+2Hg (1). Their results yield AS29s. -1
6.68, corresponding to S28 16 26.5 for ZnC12(c).
More recently, Bates (40) obtained S,98.1 =25.9 for ZnC12(c) from
cell measurements and thermal data. This value, which intermediates
the two above-given results, is adopted and the uncertainty is esti-
mated as 1.0.
Data listed by Stevenson (467) for ZnCl(g) correspond to I=173 X
10-40 and w 390. There are obtained S+r,298.16=55.96, SO,298.16 1.00,
Se,2s.1-= 1.38, and S09s.z= 58.3 0.5.
Hydride.--Molecular-constant data for ZnH(g) listed by Herzberg
(212) correspond to I 4.19X 10-40, w 1,552, and quantum weight of
the ground state=2. These values yield So+r,298.16=47.318, S ,298.16-
0.008, Se,298.16-1.378, and S398.16-48.700.10.
Iodides.-Bates (40) also reported S09s.16=38.5 for Znl(c), from cell
measurements and thermal data. Again, 1.0 is estimated as the
The molecular-constant data listed by Stevenson (467) for the ZnI(g)
molecule correspond to I=434X 10-40 and w=-240. There are com-
puted Srt,298.16= 59.71, Sv,298.16=1.80, Se,298.16=1.38, and S298.16=
Telluride.-McAteer and Seltz (347) obtained AS98.1 = -2.9 for
the reaction Zn(c)+Te(c)=ZnTe(c). This leads to Ss98.16=18.91.0
Carbonate.-Anderson (16) (580-2990) measured the heat capacity
of ZnCOs(c) (smithsonite). His data give S5;.20 =1.45 (extrapolation),
89s.1-So.20- 18.25 (measured), and S,9.1= 19.7 +0.3.
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Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation, report, 1950; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12637/m1/100/?rotate=270: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.