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Thermochemistry of inorganic sulfur compounds III. The standard molar enthalpy of formation at 298.15 K of US1.992(β-uranium disulfide) by fluorine bomb calorimetry

Authors
Journal
The Journal of Chemical Thermodynamics
0021-9614
Publisher
Elsevier
Publication Date
Volume
16
Issue
12
Identifiers
DOI: 10.1016/0021-9614(84)90189-7

Abstract

Abstract A thoroughly analyzed specimen of β-uranium disulfide of composition US 1.992±0.002 has been studied by fluorine-bomb calorimetry. The standard molar energy of combustion: Δ c U m o(US 1.992, cr, β, 298.15 K) = −(4092.5±7.5) kJ·mol −1 has been determined on the basis of the reaction: US 1.992(cr, β) + 8.976F 2(g) = UF 6(cr) + 1.992F 6(g). The standard molar enthalpy of formation: Δ f H m o(US 1.992, cr, β, 298.15 K) = −(519.7±8.0) kJ·mol −1 was derived, and from that result Δ f H m o(US 2, cr, 298.15 K) = −(521±8) kJ·mol −1 is estimated.

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