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Thermochemistry of (germanium + sulfur): III. Massic energies of combustion in fluorine and the derived standard molar enthalpies of formation of crystalline and vitreous germanium(IV) disulfide GeS2at the temperatureT= 298.15 K. Standard molar enthalpy of the transition GeS2(cr) = GeS2(vit) atT= 298.15 K. Critical assessment of thermodynamic quantities for the high-temperature reaction: GeS2(cr) = GeS(g) + 12S2(g)

✍ Scribed by P.A.G O’Hare; K.J Volin; S Susman

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
432 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

new DfH°m (GeS,cr,298.15 K) obtained in Part II of this study (J. Chem. Thermodynamics 1994, 26, 727), yield several derived results for DfH°m(GeS2,cr,298.15 K) that are in reasonable agreement with the calorimetric determinations. The standard molar enthalpy of the transition: GeS2(vit) = GeS2(cr): DtrsH°m = -(12.5 2 1.5) kJ•mol -1 at T = 298.15 K, calculated from the difference in the massic energies of combustion, is of about the same size as DtrsH°m for similar compounds of the Group-14 elements. (Throughout this abstract, uncertainties in all molar quantities are expressed as twice the standard deviation of the mean.

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Fluorine-bomb calorimetry was used to determine the standard massic energies of combustion \(\Delta_{\mathrm{c}} u^{\nu}\) of the silicon selenides \(\mathrm{SiSe}_{2}(\mathrm{cr}), \mathrm{SiSe}_{1.94}(\mathrm{cr})\), and \(\mathrm{SiSe}_{1.94}(\mathrm{vit})\), according to the combustion reaction: