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Properties of substance:

neptunium(VI) fluoride

Synonyms:

neptunium hexafluoride

Group of substances:

inorganic

Physical appearance:

rhombic crystals

Empirical formula (Hill's system for organic substances):

F6Np

Structural formula as text:

NpF6

Molar/atomic mass: 351.04

Melting point (°C):

53

Boiling point (°C):

55.2

Density:

5 (20°C, g/cm3)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

17.5 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

229.1 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

167.4 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

29.5

Standard molar entropy S0 (298.15 K, J/(mol·K)):

377 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

129 (g)

References:

  1. Simons J.H. Fluorine Chemistry. - Vol. 5. - New York: Academic Press, 1964. - pp. 106-107
  2. Браун Д. Галогениды лантаноидов и актиноидов. - М.: Атомиздат, 1972. - pp. 30 [Russian]
  3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 87 [Russian]
  4. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 216 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru