Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 72
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72 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
10.68 (extrapolation), S298.16- S53.09= 153.48 (measured), and 98,.16=-
Other Ammonium Compounds.-Crenshaw and Ritter (116) have
obtained heat-capacity data for NH4CN(c) (2030-2830) and NH4NO3
(c) (1830-2730), and Nitta and Suenaga (379) have reported values
for (ND4)2S04(c) (930-2980). These data are insufficient for entropy
calculations because of the large extrapolations involved, the difficul-
ties being enhanced by transitions of the NH4Cl-type that occur in
all three cases.
Element.-The value computed by Lewis and Gibson (331) S'98.16=
7.80.5, from Dewar's (126) heat-capacity determination of Os(c) is
The entropy of Os(g) is calculated from the Sackur equation with
R In 9 added for the quantum weight of the ground state. The result
is S298.,16 46.01 0.01.
Oxide.-Anderson and Yost (25) report 971 (1), 568 (2), 1,187
(3), and 688 (3) as the vibration frequencies of the Os04(g) molecule.
Their value of the interatomic distance (Os-O) is 1.660.05X10-8
cm., corresponding to I1,I2-I3 195 X 10-40. Calculation yields
S +r,298.16- 63.38, S0,298.,6-2.21, and S99,.,6--65.60.3 for OsO4(g).
Anderson and Yost (25) also report AF,9.16 - --70,900 and AH298.16--
-93,600 for the reaction Os(c)+202(g)=Os04(c), corresponding to
ASzs.,16--76.1. This figure leads to S,98.16 29.7 for Os04(c).
Another value may be obtained by subtracting the entropy of sub-
limation given by Kelley (270), AS20.s,16 35.8, from the entropy of
the gas. The result is S2.98,1629.8 for OsO4(c) (yellow variety).
The value S098.16-29.71.0 is adopted.
Kelley (270) found ASs.16--30.9 as the entropy of sublimation of
the white variety, which corresponds to S9s.1-= 34.7 2.0 for OsO4(c)
Element.-Low-temperature heat-capacity measurements of 02
were made by Clusius (75) (100-730), Eucken (146) (170-730), and
Giauque and Johnston (179) (120-910). The heat of vaporization
was determined by Frank and Clusius (162). The calculations of
Giauque and Johnston, which have been checked, are repeated here.
They find Sl1.75--0.32 (extrapolation), S23.66-S01.75-=1.70 (crystals
III), AS3 .6--22.42/23.66=0.95 (transition), S3.7 - S'.66-4.66 (crys-
tals II), AS-3.76- 177.6/43.76=4.06 (transition), S04.39-S.76= 2.40
(crystals I), AS54.39-106.3/54.39 1.95 (fusion), So0.13-S 4.39-6.46
(liquid), AS90.13 1,628.8/90.13 18.07 (vaporization at 1 atm. pres-
sure), AS0.13 0.17 (correction to ideal gas state), and SI2s.16-S0.-13
8.35 (gas). The sum is S98.1oz49.100.10.
Giauque and Johnston also have calculated the entropy from
spectroscopic data, obtaining S2s.16 49.03. Gordon and Barnes
(199) obtained S29.1'6 49.00 and, just recently, Woolley (504) com-
Molecular-constant data (212), I= 19.38 X 10-40, = 1,568, and
quantum weight=-3 for the ground state, yield S+r,298.16=46.808,
S.2,s. 6-0.008, S,29Ss.16-2.183, and Sos.16-49.00.
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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/m1/76/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.