Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 90
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90 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
of the ground state is 3. There are obtained S+r,298.18= 60.16,
S3,23s.16= 1.73, S,298.16-2.18, and S29s.=6--64.1-0.3.
Oxide.-Geblen and Gehlen-Keller (167) have reported values of the
heat and free energy of formation of TeO2(c) which lead to ASs98.16=
-44.1 for the entropy of formation. This figure, in turn, results in
S98.,16- 16.8- 1.0 for TeO2(c).
Hexafluoride.-Sachsse and BartholomB (409), Yost (505), and Yost
and Claussen (508) have listed 165(3), 313(3), 370(3), 674(2), 701(1),
and 752(3) as the vibration frequencies of the TeF6(g) molecule.
Yost also gives the Te-F distance as 1.84X 10- cm., corresponding
to 1=427 X 10-40. The symmetry number is 24. There are com-
puted S+r,298.16 64.18, Sv,298.16 -16.48, and S98.16 = 80.7 1.0.
Element.-The heat capacity of Tl(c) was measured by Clusius and
Vaughen (105) (110-2490), Hicks (215) (140-2990), Nernst and
Schwers (377) (220-960), and Keesom and Kok (257, 258, 259) (1.30-
4.20). The entropy is S298.16= 15.35 0.06, of which the extrapola-
tion below 1.30 is about 7X10-4.
The entropy of Tl(g) from the Sackur equation, with R In 2 added
to account for the quantum weight of the ground state, is S298.16
Thallous Ion.-The entropy of Tl+(aq.) was reported by Latimer,
Pitzer, and Smith (325) as S,9s.916-30.50.4. Data for two re-
actions were considered, TINO3(c)=Tl+(aq.) +NO3-(aq.) and Tl(c)+
AgCl(c)= Ag(c) +Tl+ (aq.) +Cl-(aq.),from which the respective values
are 31.00.5 and 30.1 0.5. The value given by Hicks (215), 30.2,
is in excellent agreement.
Bromide.-The residual-ray data of Rubens and Hollnagel (404)
yield S98.16=--26.81.0 for TlBr(c). From thermal data of Ishikawa
and Terui (220) for the reaction Tl(c)+1/2 Br2(1)=T1Br(c), there is
obtained AS'98.1= -5.9 which, in turn, leads to S298.16--27.8 for
T1Br(c). The former value is adopted.
Brockway (55) gave 2.68X 10- cm. as the Tl-Br distance in the
T1Br(g) molecule, which corresponds to I=685X10-40. Herzberg
(212) reported 192 cm.- as the vibration frequency. These values
yield S 2r,298.16-- 61.78, o,198.16 2.21 and S98s.16= 64.0 0.5. Kelley
(270) reported S298.16-63.2 from vapor-pressure data and the entropy
of the solid, an agreeing but less-reliable result.
Chloride.-Pollitzer (393) (230-940) measured the heat capacity of
T1Cl(c). The data yield S2.4=0.56 (extrapolation), S298.16-S22.4=
25.31, and S298.16- 25.90.6.
The cell measurements of Gerke (169) give AS98s.1=--l1.1 for the
reaction T1(c) +AgCl(c)- T1Cl(c) +Ag(c). This value leads to So.16
=27.00.5, in disagreement with the third-law result.
Still another value for TICl(c) is obtainable from the residual-ray
data of Rubens and Hollnagel (404), which yield S98s.16=23.7 1.0.
Finally, a fourth value is obtained from the entropy of T1CI(g),
given below, and the entropy of sublimation, AS098s.s= 34.4, from the
heat and free-energy values of Kelley (270). The result is S98.16-
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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/m1/94/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.