Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 89
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ENTROPIES OF INORGANIC SUBSTANCES AT 298.16 0K.
Sulfuric Acid and Ions.-Latimer, Pitzer, and Smith (325) reported
S98.16= 30.6 2 for HSO4-(aq.), from data for the reaction S04--(aq.)
+1H+ (aq.) = HSO4- (aq.). They also obtained S,s.16-4.41.0 for
S04--(aq.), using data on four reactions, Na2S04-10H20(c)
2Na+ (aq.) + SO4-- (aq.) + 10H20 (1), Ag2SO4 (c) - 2Ag+ (aq.) + SO4-- (aq.),
CaSO42H20 (c)= Ca++(aq.) +SO4-- (aq.) +2H20 (1), and PbSO4(c) +
2H20 (1) = H2 (g) + PbO2 (c) SO4-- (aq.) + 2H+ (aq.). The value, S'"s.18=
4.4 1.0, is also the entropy of H2SO4(aq.).
Sulfurous Acid and Ions.-Latimer, Pitzer, and Smith (325) re-
ported S298.1654.71.0 for H2S03(aq.), from thermal data for the
reaction S02(9)+H20(1) -H2SO3(aq.). They also report S298.16-
32.61.5 for HSO3-(aq.) from data for the reaction H2SO3(aq.) =
H+(aq.) +HSO3-(aq.). The National Bureau of Standards tables
(370) list S98.16=10.4 for S03--(a.).
Other Acids and Ions.-The National Bureau of Standards tables
(370) list the following values of S99s.16: 35 for H2S208(aq.), 57.9 for
S203--(aq.), 57 for S204--(aq.), 35 for S20s--(aq.), and 120.5 for
Element.-The heat capacity of Ta(c) was measured by Keesom
and Desirant (248) (1.30-4.80), Kelley (278) (530-2950), and Simon
and Ruhemann (441) (710-78o). There is obtained S2098.,6=9.94
0.04, of which only about 3X 10-4 is extrapolation below 1.4'.
The entropy of Ta(g) is obtainable from the Sackur equation and
spectroscopic data. For the latter, the tabulation of Moore (364)
shows that only two states need be considered at 298.160. These
states have term values of 0 and 2,010.0 cm.-' and quantum weights
of 4 and 6, respectively. They add 2.757 to the Sackur equation,
making S9,s.6,-44.25 0.01.
Oxide.-Kelley (279) (530-2950) measured the heat capacity of
Ta20s(c). The data yield S03 .,-2.83 (extrapolation), S98s.16-S53-10=
31.36 (measured), and S098.16-34.2 0.3.
Carbide.-Kelley (279) (540-2950) measured the heat capacity of
TaC(c). There are obtained Ss3.,o=0.95 (extrapolation), S298.16-
S.10o= 9.16 (measured), and SS.16= 10.11 0.08.
Element.-Anderson (23) (540-2920) and Slansky and Coulter (446)
(140-3020) measured the heat capacity of Te(c). The data are in
fair agreement, but Slansky and Coulter showed that Anderson's
extrapolation of his results is in error. The calculations of Slansky
and Coulter have been checked. There are obtained Sl2.59-0.14
(extrapolation), S8.1--S12.59 11.74 (measured), and Sfs.16=11.88
In calculating the entropy of Te(g), R In 5 is added to the Sackur
equation to account for the quantum weight of the ground state.
No other states are concerned at 298.160. The result is S.9816=
Herzberg (212) has listed molecular-constant data for Te2(g) cor-
responding to 1=711X 10-40 and w=250.5. The quantum weight
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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/m1/93/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.