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Properties of substance:
niobium(V) chloride
Group of substances:
inorganic
Physical appearance:
monoclinic crystals
Empirical formula (Hill's system for organic substances):
Cl
5
Nb
Structural formula as text:
NbCl5
Molar/atomic mass: 270.17
Melting point (°C):
205
Boiling point (°C):
247.5
Solubility (g/100 g of solvent):
acetic acid
: soluble [
Ref.
]
acetone
: soluble [
Ref.
]
carbon disulphide
: soluble [
Ref.
]
carbon tetrachloride
: soluble [
Ref.
]
chloroform
: soluble [
Ref.
]
diethyl ether
: soluble [
Ref.
]
ethanol
: soluble [
Ref.
]
iodine monochloride
: very soluble [
Ref.
]
propylene carbonate
: 85 (25°C) [
Ref.
]
water
: reaction [
Ref.
]
Density:
2.75 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
NbCl
5
+ 5HF → NbF
5
+ 5HCl
Vapour pressure (Torr):
10 (142.6°C)
100 (186.3°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-797.5 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-687.7 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
226 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
147.9 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
33.9
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
52.3
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-703 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
407 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
120.5 (g)
LD
50
(mg/kg):
1400 (rats, oral)
830 (mice, oral)
References:
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 174-175 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 88 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru