Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 88
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88 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
of the SO2(g) molecule. The vibration frequencies were given by
Badger and Bonner (33) as 525, 1,152, and 1,361. There are com-
puted Sf+r,298.16-58.618 and Sv,298.16-0.670. The sum is S98.16,,
59.29 0.15, which is in excellent agreement with the third-law value.
Agreeing calculations have been made by Cross (119) and Giauque
and Stephenson (186). In the older calculation of Gordon (197)
erroneous moments of inertia were used.
Trioxide.-Stockmayer, Kavanagh, and Mickley (472) have listed
molecular constants of the SO3(g) molecule and have calculated the
entropy. The moments of inertia are =1-2-81.5X 10-40 and 13=
163 X 10-40, and the vibration frequencies are 530 (1), 560 (2), 1,068 (1),
and 1,332 (2). The molecule is considered to be planar, with sym-
metry number 6. There are computed St,+7,298.168 59.40, S ,298.16=- 1.82
(with allowance of 0.07 for anharmonicity, according to Stockmayer,
Kavanagh, and Mickley), and S298.16 61.2 1.0.
The entropy of vaporization of SO3(1) is AS98.1 =32.1 (270). This
and the value for the gas lead to S,98.16-29.12.0 for S03(l).
Dichloride.-McDowell and Moelwyn-Hughes (349) have suggested
molecular-constant data for the SC12(g) molecule and have estimated
the entropy. The moments of inertia are I1=60.6X 10-, 12=286X
10-40, and I3-347 X 10-, according to their dimensional values, and
the estimated vibration frequencies are 206, 404, and 461. These
figures yield S+r,298.16=64.04, S =,298.16-3.79, and S298.18=-67.81.0.
Sulfuryl Chloride.-Thompson (484) has considered the SOC122(g)
molecule and has given the vibration frequencies as 214, 280, 365, 390,
408, 560, 576, 1,190, and 1,415. His dimensional values yield I,=
I,=213-=383 X 10-40. There are computed So,,298.16=66.99, S,298.16-
7.64, and S9.98.16=74.6 1.0 for SO2C12(g). Employing AS 98.16 22.7
(270) as the entropy of vaporization, there is obtained S298.c6= 51.9 2
for S02C12 (1).
Hexafluoride.-Eucken and Schrdder (150) (130-2300) measured
the heat capacity of SF8. Calculations from their data yield S12.6-
1.08 (extrapolation), S94.30-SI2.6= 18.13 (crystals II), AS94.30
384.2/94.30=4.07 (transition), S186.0- Se4.30z11.47 (crystals I),
AS86.0= 5,615/186.0-30.19 (sublimation at 0.161 atm. pressure), and
AS86.0-= -3.63 (compression from 0.161 to 1 atm.). The entropy
increment for warming the gas from 186.00 to 298.160 is S298.16-
S~s8.0-8.96 (gas), calculated from molecular-constant data given
below. These quantities add to give S298.16-70.30.7.
Yost (505) and Yost and Claussen (508) have reported 1.58X10-8
cm. as the S-F distance in the SF,(g) molecule and 775 (1), 645 (2),
525 (3), 363 (3), 617 (3), and 965 (3) as the vibration frequencies.
From the dimensional value, I1==12I3-315X 10-40. There are
computed St+r,298.16861.78, S ,298.18=7.74, and S298.16= 69.50.5 for
SF6(g). This value is adopted.
Aqueous Hydrogen Sulfide and Ions.-Latimer, Pitzer, and Smith
(325) obtained S298.16-29.40.3 for HS(ttq.), from data for the
reaction H2S(g)= H2S(aq.). The same authors also obtained
S98.16-= 14.9 1.0 for HS-(aq.), from data for the reaction H2S(aq.)=
H+ (aq.) + HS- (aq.). The National Bureau of Standards tables (370)
list S,98.1-6= 5.3 for S-- (aq.).
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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/m1/92/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.