Contributions to the Data on Theoretical Metallurgy: [Part] 11. Entropies of Inorganic Substances: Revision (1948) of Data and Methods of Calculation Page: 64
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64 CONTRIBUTIONS TO DATA ON THEORETICAL METALLURGY
Fluoride.-Stout and Adams (473) (130-3110) measured the heat
capacity of MnF2(c). They obtained S1 .0 0.22 (extrapolation),
S098.16-S1.o-22.03 (measured), and S29s .16-= 22.25 0.10.
Selenide.-Kelley (275) (540-2870) measured the heat capacity of
MnSe(c). The data yield S'3.1-2.78 (extrapolation), S298.16-S =.1-
18.95 (measured), and S98.16-- 21.7 4 0.4.
Silicate.-The heat capacity of MnSiO3(c) was measured by Kelley
(282) (520-2950). There are computed S50.12=1.69 (extrapolation),
S2098.16-S0.12 19.61 (measured), and S98.16=21.3 0.2.
Sulfide.-Anderson (12) (590-297') measured the heat capacity of
MnS(c). There is obtained S209.16=18.70.4, of which 2.14 is extra-
polation below 56.20.
Sulfate.-Moore and Kelley (365) (530-2950) measured the heat
capacity of MnSO4(c). The data yield S~o0.--2.72 (extrapolation),
S209S.16-S0.12=-24.07 (measured), and S98.16 -26.8 0.2.
Telluride.-Kelley (275) (540-3270) measured the heat capacity of
MnTe(c). There are obtained S53.1 3.35 (extrapolation), S298.16-
S~ .1 19.07 measuredd), and Sg98.16- 22.4 0.4.
Dithionate.-The heat capacity of MnS206-2H20(c) was measured
by Kelley and Moore (294) (530-2950). Their data yield So0.12=7.15
(extrapolation), S9g9s.6-S5 0.12-59.51 (measured), and S098.16 -66.7
- 0.8. These workers also estimated $298.16=45 for MnS206(c) and
S99 .l,- 110 for MnS266H20 (c).
Permanganate Ion.-Latimer, Pitzer, and Smith (325) obtained
Sl9s.16=46.70.4 for MnO -(aq.) from thermal data for the reaction
KMnO4(c) = K+ (aq.) + MnO4- (aq.).
Element.-The heat capacity of Hg at low temperatures was meas-
ured by Carpenter and Stoodley (69) (1970-2340), Pollitzer (392, 393)
(310-2430), and Simon (437, 438) (30-2320). Pollitzer measured the
heat of fusion as 554.5 cal. per mole, while Bridgeman (54) obtained
560 cal. per mole. The mean value, 557.2, is adopted. Henning
(210) gave 234.20 as the melting point. The entropy calculations
are S3.1-- 0.03 (extrapolation), S234.2-3.16-14.47 (crystals), AS234.2--
557.2/234.2-2.38 (fusion), and S9,s.6-S034.2= 1.65 (liquid). The sum
is S098.16- 18.53 0.10.
The Sackur equation gives S8s.16=41.800.01 for Hg(g). Only
the lowest energy state, whose quantum weight is 1, is effective at
There is estimated here S s9.o6- 66.0 1.0 for Hg2(g).
Ig2 +(aq.) Ion.-Latimer, Pitzer, and Smith (325) obtained
S8.16= --17.73 for Hg2++(aq.) from thermal data for the reaction
2Hg(1) +2H+ (aq.)= Hg2++ (aq.) +H2 (g).
Oxides.-Giunther (204) (25'-750) measured the heat capacity of
HgO (red). His data lead to Ss98.16= 16.6 1.0, the extrapolation
below 25.10 being 0.83.
The cell measurements of Fried (163) give AS29s.81= -14.0 for the
reaction HgO (yellow) +H2(g)= H20(1)+Hg(l). As the other entro-
pies are known, there results Ss98.16 18.1 for HgO (yellow). The same
reaction was studied by Shibata and Murata (423) and Shibata,
Kobayashi, and Furukawa (424). Their results yield ASs9.16-
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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/m1/68/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.