Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 83
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ENTROPIES OF INORGANIC SUBSTANCES AT 298.16 0K.
Ag20 (c). Also, in a discussion of the properties of Ag2CO3(c), Kelley
and Anderson (290) derived S,98s.,6=29.7 for Ag20(c).
Sulfide.-Kelley (273), from a consideration of available equilibrium
data, has obtained S298.16-35.0+1.0 for Ag2S(a). This value is
checked by e. m. f. measurements of Kimura (302), which yield
AS2,8s.1= -3.83 for the reaction 2Ag(c) +H2S(g)=H2(g) +Ag2S(a).
This value, in turn, leads to S298.16-=34.5 for Ag2S(a).
Bromide.-Eastman and Milner (138) (24'-2900) and Eucken,
Clusius, and Woitinek (155) (110-2740) measured the heat capacity
of AgBr(c). Using both sets of data, S1.22-0.27 (extrapolation),
S298.16-S11.22= 25.33 (measured), and S98 .16 25.60 0.10. The
residual-ray data of Rubens (403) lead to S,98 .1-26.1 0.5.
Molecular-constant data suggested by Stevenson (467), I=400X
10-40 and w 248, lead to S'+r,298.16-59.48, S ,298.16=1.74, and
S 98.= 61.20.5 for AgBr(g).
Chloride.-The heat capacity of AgCl(c) was measured by Clusius
and Harteck (100) (100-126'), Eastman and Milner (138) (150-2930),
Nernst and Schwers (377) (220-920), and Nernst (373) (230-2080).
From the data of Clusius and Harteck and of Eastman and Milner
there are obtained So0.0o-0.14 (extrapolation), S',s .8-S 1.00= 22.86
(measured), and S298 .16- 23.00 0.10. The residual-ray data of
Rubens (403) permit calculation of S298.16-22.5 0.5.
Molecular-constant values for AgCl(g) listed by Stevenson (467)
correspond to I=205X10-40 and 2-343. There are calculated
St+r,298.16= 57.34, Sv,298.16= 1.20, and S9,s8.,6-58.50.5 for AgCl(g).
This value is adopted. The entropy of the solid and vaporization
data (270) combine to give an approximately agreeing value, S98.16-=
Fluoride.-There is estimated here S",.16=56.10.5 for AgF(g).
Hydrides.-Herzberg (212) has listed molecular constants for
AgH(g), corresponding to 1-4.34X10-40 and w=-1,726. There are
computed S1+r,298.1648.863, S ,29s.16=0.004, and S~,98 .6-48.87
For AgD(g), the nuclear separation listed by Herzberg (212) yields
8.59 X 10-40 as the moment of inertia. There is computed St-r,298.16 =
50.25. The vibration frequency is not known and the vibrational
contribution to the entropy is estimated here as 0.05. The sum is
S298.16-= 50.3 4-+ 0.1.
Iodide.-Nernst and Schwers (377) (170-117'), Nernst (373) (290-
1370), and Pitzer (388) (150-3020) measured the heat capacity of
AgI (c). The entropy calculation of the last-named investigator has
been checked and will be adopted. There are obtained S1.00= 1.5 0.3
(extrapolation), Ss98.16- S5 .oo0026.09 0.1 (measured), and S8,s.16=
An identical value is obtainable from Gerke's (169) cell measure-
ments, which give AS298.16= -8.0 for the reaction Pb(c)+2Agl(c)=
PbI2(c)+2Ag(c). This value results in S098.16=27.60.4 for AgI(c).
From data listed by Stevenson (467), 1= 595 X 10-40 and w=206 for
AgI(g). There are calculated S+r,298.16= 60.93, S ,298.16=-2.08, and
S98.1 = 63.0 1 0.5.
Carbonate.-Anderson (14) (530-2910) measured the heat capacity
of Ag2COa(c). His data yield S298.16=40.010.9. The extrapolation
is 7.86 below 56.20.
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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/m1/87/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.