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Properties of substance:
argon
Group of substances:
inorganic
Physical appearance:
colorless gas
Empirical formula (Hill's system for organic substances):
Ar
Structural formula as text:
Ar
Molar/atomic mass: 39.95
Melting point (°C):
-189.6
Boiling point (°C):
-185.9
Solubility (g/100 g of solvent):
acetone
: 0.062 (20°C) [
Ref.
]
benzene
: 0.045 (20°C) [
Ref.
]
cyclohexane
: 0.07 (20°C) [
Ref.
]
ethanol
: 0.054 (20°C) [
Ref.
]
methanol
: 0.056 (20°C) [
Ref.
]
perfluoro-n-heptane
: 0.05485 (25°C) [
Ref.
]
perfluoromethylcyclohexane
: 0.05587 (4.93°C) [
Ref.
]
perfluoromethylcyclohexane
: 0.05417 (15.2°C) [
Ref.
]
perfluoromethylcyclohexane
: 0.05354 (20.02°C) [
Ref.
]
perfluoromethylcyclohexane
: 0.0527 (25.32°C) [
Ref.
]
perfluoromethylcyclohexane
: 0.05159 (34.7°C) [
Ref.
]
perfluorotributylamine
: 0.03185 (4.5°C) [
Ref.
]
perfluorotributylamine
: 0.03041 (19.43°C) [
Ref.
]
perfluorotributylamine
: 0.02993 (25°C) [
Ref.
]
perfluorotributylamine
: 0.02935 (31.83°C) [
Ref.
]
water
: 0.0093 (0°C) [
Ref.
]
water
: 0.0059 (20°C) [
Ref.
]
water
: 0.0045 (40°C) [
Ref.
]
Numerical data:
Year of discovery: 1894
Ionization Potentials (Electronvolts): 15.76
Density:
1.65 (-233°C, d
4
)
0.402 (-185.7°C, g/cm
3
)
0.0017839 (20°C, g/cm
3
)
Half-life:
33
18
Ar = 0.18 s (β
+
)
34
18
Ar = 0.841 s (β
+
)
35
18
Ar = 1.781 s (β
+
)
36
18
Ar = stable ( (isotopic abundance 0,337%))
37
18
Ar = 34.8 d (electron capture)
38
18
Ar = stable ( (isotopic abundance 0,063%))
39
18
Ar = 269 y (β
-
)
40
18
Ar = stable ( (isotopic abundance 99,6%))
41
18
Ar = 109.6 min (β
-
)
42
18
Ar = 32.9 y (β
-
)
43
18
Ar = 5.37 min (β
-
)
44
18
Ar = 11.87 min ()
45
18
Ar = 21.48 s (β
-
)
46
18
Ar = 8 s (β
-
)
Vapour pressure (Torr):
1 (-219.5°C)
10 (-211.3°C)
100 (-200.1°C)
Permittivity (dielectric constant):
1.000504 (25°C)
1.3247 (-133.2°C)
Viscosity (mPa·s):
0.021 (0°C)
0.0269 (100°C)
0.0321 (200°C)
0.0411 (400°C)
Speed sound (m/s):
319 (0°C, aggregative state - gas)
321 (20°C, aggregative state - gas)
325.23 (30.2°C, aggregative state - gas)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (g)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
154.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.79 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
1.19
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
6.51
Critical temperature (°C):
-122.5
Critical pressure (MPa):
4.86
Critical density (g/cm
3
):
0.531
References:
Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 59-61
Гороновский И.Т., Назаренко Ю.П., Некряч Е.Ф. Краткий справочник по химии. - 5 изд. - Киев: Наукова думка, 1987. - pp. 38-39 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 44 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 27, 54 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 578-583 [Russian]
Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 194 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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