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Properties of substance:
sulfur trioxide γ form
Group of substances:
inorganic
Physical appearance:
colorless monoclinic crystals
Empirical formula (Hill's system for organic substances):
O
3
S
Structural formula as text:
SO3
Molar/atomic mass: 80.06
Solubility (g/100 g of solvent):
dimethylsulfoxide
: very soluble [
Ref.
]
hydrogen fluoride
: reaction [
Ref.
]
sulfuric acid
: reaction [
Ref.
]
Vapour pressure (Torr):
0.1 (-32.7°C)
1 (-15.5°C)
10 (4.3°C)
100 (27.4°C)
Dipole moment (D):
0 (20°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-439 (l)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-368.4 (l)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
122 (l)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
180 (l)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
30
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
40.8
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-395.8 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
256.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
50.7 (g)
LD
50
(mg/kg):
1.5-2 (rabbits, onto the skin)
Critical temperature (°C):
218
Critical pressure (MPa):
8.2
Critical density (g/cm
3
):
0.633
References:
Bell C.F. Syntheses and Physical Studies of Inorganic Compounds. - Pergamon Press, 1972. - pp. 102-112
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 97 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 333 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru