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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):
O
7
Tc
2
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 Δ
f
H
0
(298.15 K, kJ/mol):
-1114.6 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-937.6 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
191.6 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
47.75
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
58.79
References:
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 104 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 560 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru