Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 22
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22 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
of A1203. Considering all the data, there is obtained Ss98.18= 12.5 0.15
for A1203(c), the extrapolation below 28.180 being 0.03.
Molecular constant data for AlO(g) (212, 311) yield S99s.18=52.14
0.10, of which 0.105 is vibrational entropy. The quantum weight of
the ground state is taken as 2.
Hydrated Oxides.-Shomate and Cook (434) (A1203-H20, 520-2970;
and A1203.3H20, 520-2970) have made low-temperature heat-capacity
measurements of two hydrated crystalline aluminum oxides.
The entropy of A1203.H20 (crystal form not designated) is S298s.18=
23.15 0.10. The extrapolation below 52.000 is 0.94.
For A1203-3H20 (gibbsite) the entropy is S9s.81= 33.5 0.2, of which
1.40 is extrapolation below 52.000.
Chloride.-Molecular-constant data for AlCl(g) (212, 311) yield
S98s.16- 54.4 0.5.
Hydrides.-Molecular-constant data are available for AlH(g) and
AID(g) (212, 311). For the former there is computed S98s.16=44.84
0.10, and for the latter, S298.16=46.280.10.
Nitrate.-Shomate and Kelley (435) (530-2970) measured the low-
temperature heat capacity of Al(N03)3.6HO2(c). The entropy cal-
culation yields S,98 .1= 111.81.1, with an extrapolation below
53.090 of 15.82.
Silicates.-Simon and Zeidler (444) (kyanite, 240-2240; sillimanite,
170-2820; and andalusite, 230-2800) and Todd (486) (kyanite, silli-
manite, and andalusite, 520-2980) have measured low-temperature heat
capacities of three crystalline varieties of A2ISiOs. The data are in
disagreement, and only those of Todd are employed in arriving at
the following entropy values: Kyanite, S0298.168=20.020.08; silli-
manite, S0298.16=22.97 -0.10; and andalusite, S0298.16= 22.28 0.10.
The extrapolated portions, below 51.000, are 0.32, 0.73, and 0.62
Sulfates.-Shomate (426) (Al2(SO4)3, 540-2970; and Al2(SO4)3-6H,0,
540-2970) measured the heat capacities of anhydrous and hydrated,
crystalline aluminum sulfates.
The entropy calculation for A12(S04)3(c) yields S98.16,= 57.20.3, of
which 3.76 is the extrapolation below 53.090.
For A12(SO4)3.6H20 there is obtained S98s.16=112.10.9. The
extrapolation below 53.090 is 11.23.
Element.-Anderson (10) (660-2940), Giinther (205) (800-98o), and
Simon and Ruhemann (441) (710-820) measured the heat capacity of
Sb (c). The data of Giinther and of Simon and Ruhemann do not
agree with those of Anderson or with each other, and they have been
given no weight as they cover such small temperature ranges. Ander-
son's measurements yield S98s.e= 10.50.3. The extrapolated portion
is 2.34 below 63.10.
The entropy of Sb(g) may be obtained from the Sackur equation
with R In 4=2.755 added to account for the quantum weight of 4 for
the lowest energy level. The result is S98.,1643.070.01.
Almy (6) and Naud6 (372) have reported the vibration frequency
of the Sb2(g) molecule and Genard (168) has reported the moment
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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/m1/26/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.