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 |
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Authors: | JL Settle PAG OHare |
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Institution: | Argonne National Laboratory, Argonne, Illinois 60439, U.S.A. |
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Abstract: | A thoroughly analyzed specimen of β-uranium disulfide of composition US1.992±0.002 has been studied by fluorine-bomb calorimetry. The standard molar energy of combustion: ΔcUmo(US1.992, cr, β, 298.15 K) = ?(4092.5±7.5) kJ·mol?1 has been determined on the basis of the reaction: US1.992(cr, β) + 8.976F2(g) = UF6(cr) + 1.992F6(g). The standard molar enthalpy of formation: ΔfHmo(US1.992, cr, β, 298.15 K) = ?(519.7±8.0) kJ·mol?1 was derived, and from that result ΔfHmo(US2, cr, 298.15 K) = ?(521±8) kJ·mol?1 is estimated. |
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