Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 77
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ENTROPIES OF INORGANIC SUBSTANCES AT 298.160K.
Fluoride.-The entropy of KF (g) is estimated from the relation-
ship, S F= M (SK 2+SF2) +R In 2, to be SE98.16 55.4 1.0. A probably
less reliable value, 56.7 1.8 was estimated by Niwa (380).
Hydride.-Herzberg (212) listed molecular-constant data for KH(g)
corresponding to I=8.22X10-40 and w=969. These figures yield
St+r,298.16=47.155, SV,298.16 0.106, and S98,16- 47.26 0.10.
Iodide.-From Rubens and von Wartenberg's (405) residual-ray
data, S298.16=24.1 10.5 is computed for KI(c).
Molecular-constant data listed by Herzberg (212) correspond to
I 518 X 10-40 and w- 211 for KI (g). There are computed S+r,298,16
59.63,S ,298.16-2.03 and S~9s.1 =61.7 0.5. Correction of Stevenson's
(467) calculation leads to an agreeing value, 61.5, while Niwa (380)
has estimated a too low value, 60.7 1 2.1.
Bromate.-The heat capacity of KBrO3 (c) was measured by Ahlberg
and Latimer (4) (150-297'). Their data yield S2 1,6 -35.70.2,
of which 0.23 is extrapolation below 14.13' and 35.44 is measured
between 14.13' and 298.160.
Chlorate.-Latimer, Schutz, and Hicks (327) (130-2940) measured
the heat capacity of KC103(c). There is computed S95s.2-=34.2 0.2,
with an extrapolation below 12.590 of 0.14.
Perchlorate.-Latimer and Ahlberg (317) (120-2990) measured the
heat capacity of KC104(c). Calculation gives S298.16 36.1 0.2.
The extrapolation is 0.29 below 12.60.
Iodate.---The heat capacity of KI03(c) was measured by Ahlberg
and Latimer (4) (170-2950). The results of the entropy calculation
are S 15s85=0.36 (extrapolation), S5 s.16-S5.85--35.87 (measured),
and S298.16 = 36.2 0.2.
Nitrate.-Southard and Nelson (451) (1.50-2960) measured the
heat capacity of KNO3(c). There are obtained Si4.13=0.22 (extra-
polation), S9S.16-S4.1331.59 (measured), and S8'16-31.80.15.
Permanganate.-The heat capacity of KMnO4(c) was measured
by Brown, Smith, and Latimer (62) (14'-296'). Their results yield
S 4.79= 0.53 (extrapolation) and Ss98.16-S4.7 = 40.51 (measured),
making S98s.16 41.0 0.2.
Sulfate.-Moore and Kelley (365) (520-2960) measured the heat
capacity of K2SO4(c). There are computed S50.12=4.82 (extrapola-
tion), S .1-S50.12-37.21 (measured), and Ss98.16 42.0 0.4.
Potassium-Aluminum Sulfates.-Shomate (427) and Kelley, Sho-
mate, Young, Nay]or, Salo, and Huffman (297) have reported low-
temperature heat-capacity data for KAl(SO4) (c) (540-297') and
KAl(SO4)2.12H20(c) (520-2970). The latter substance also was
studied by Eucken and Schwers (151) (250-910).
For KAl(S04)2(c), the data yield S53.0 4.97 (extrapolation),
S;,s.16-S53.0943.91 (measured), and S29s.16=48.9 0.4.
Similarly, for KAl(SO4)2.H20 (c), Ss.0-, 20.94 (extrapolation,) S'9.7-
o503.09=4.22 (crystals II), AS,.7=--46.9/59.7= 0.79 (transition), and
S98.16-S 9.7--138.33 (crystals I). The sum is S2s.1-=164.3 2.0.
Potassium Basic Alum.-Kelley, Shomate, Young, Naylor, Salo,
and Huffman (297) (540-2970) reported heat-capacity measurements
of K20-3A203.5SOH3920 (c). There are obtained S3.09= 17.95
(extrapolation), S298.16 -853.09 = 204.82 (measured), and S9s.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/m1/81/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.