Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 57
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ENTROPIES OF INORGANIC SUBSTANCES AT 298.160K.
Pyrite.-The heat capacity of FeS2 (pyrite) was measured by Ander-
son (21) (550-2970) and Eucken and Schwers (151) (210-840). The
data of the former are the more certain. There are computed
S6.2= 0.35 (extrapolation), S298.16- S56.2= 12.39 (measured), and
S298.16= 12.7 0.2.
Ferrous Sulfate.-The heat capacity of FeSO4 (c) was measured by
Moore and Kelley (365) (530-2950). The data yield S10.12= 2.10
(extrapolation), S98.16-S50.12= 23.60 (measured), and S s8.16= 25.7=
Ferrous Titanate.-Shomate (430) (510-2970) measured the heat
capacity of FeTiO, (ilmenite). Calculation gives S500.42 (extrapola-
tion) - 2.01, S9s.,,6- S0.42= 23.31 (measured), and S S.16=- 25.3 + 0.3.
Element.-Clusius (79) (100-1210) and Clusius, Kruis, and Kon-
nertz (107) (630-1240) have measured the heat capacity of Kr. Cal-
culations from these data give S10= 0.57 (extrapolation), Sl15.95-So0=
12.18 (crystals), ASs15.95=390.7/115.95= 3.37 (fusion), S19.93-S115.95-
0.35 (liquid), AS119.93=2,158/119.93=18.00 (vaporization at 1 atm.
pressure), AS119.93--0.17 (correction to ideal gas state), and S29.18-
S1,09.93=4.53 (gas). The sum is S98s.18=39.170.10 for Kr (g). A
somewhat better value is that obtained from the Sackur equation,
S2098.1= 39.20 0.01.
Element.-In accordance with Lewis and Gibson (331) the entropy
of La(c), to which is assigned the uncertainty 0.8, is taken as
S2098.1= 13.7 0.8.
The entropy of La(g) may be obtained from spectroscopic data
listed by Moore (364). At 298.160, four energy levels, 2D3/2, 2D5/2,
4F312, and 4F5/2, must be considered. The term values are 0, 1,053.2,
2,668.2, and 3,010.0, respectively, and the quantum weights are 4, 6,
4, and 6. These states add 2.867 to the Sackur equation to make
S298.16- 43.57 0.01.
Lanthanum-Magnesium Nitrate.-The heat capacity of La2Mg3
(N03)12.24H20(c) was measured by Fornoff, Pitzer, and Latimer (159)
(150-3010). They obtained S15.55= 2.8 (extrapolation), S298.16- S15.55=
522.4 (measured), and S09s.16= 525.2 2.6.
Element.-The heat capacity of Pb(c) was measured by Bronson
and Wilson (58) (2030-3030), Eucken and Schwers (151) (150-2760),
Keesom and Andrews (244) (20-200), Keesom and van den Ende
(249, 250) (20-200), Keesom and Onnes (265) (140-810), Meads,
Forsythe, and Giauque (354) (150-3000), and Nernst (372, 376),
(230-2730). There is computed S298s.6= 15.490.05, of which 0.007
is extrapolation below 30
The entropy of Pb (g), obtained from the Sackur equation, is
For Pb2(g), there is estimated here S98.s16=65.5 50.5.
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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/m1/61/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.