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Properties of substance:

technetium(VII) oxide

Group of substances:

inorganic

Physical appearance:

yellow crystals

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

O7Tc2

Structural formula as text:

Tc2O7

Molar/atomic mass: 309.81

Melting point (°C):

119.5

Boiling point (°C):

311

Solubility (g/100 g of solvent):

1,4-dioxane: soluble [Ref.]
hydrogen fluoride : sparingly soluble [Ref.]
water: soluble [Ref.]

Not numerical data:

hygroscopic

Vapour pressure (Torr):

0.1 (100.5°C)
1 (123.6°C)
10 (173.2°C)
100 (237.9°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-1114.6 (s)

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

-937.6 (s)

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

191.6 (s)

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

47.75

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

58.79

References:

  1. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 104 [Russian]
  2. Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 560 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru