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Properties of substance:
krypton
Group of substances:
inorganic
Physical appearance:
colorless gas
Empirical formula (Hill's system for organic substances):
Kr
Structural formula as text:
Kr
Molar/atomic mass: 83.8
Melting point (°C):
-157.37
Boiling point (°C):
-153.22
Solubility (g/100 g of solvent):
benzene
: 0.282 (19°C) [
Ref.
]
ethanol 96%
: 0.239 (19°C) [
Ref.
]
toluene
: 0.358 (18°C) [
Ref.
]
water
: 0.041 (0°C) [
Ref.
]
water
: 0.022 (25°C) [
Ref.
]
water
: 0.017 (50°C) [
Ref.
]
Numerical data:
Year of discovery: 1898
Ionization Potentials (Electronvolts): 14
Density:
2.155 (-153.2°C, g/cm
3
)
0.003708 (20°C, g/cm
3
)
Reactions:
[
Ref.1
]
Kr + F
2
→ KrF
2
[
Ref.1
]
Kr + F
2
→ KrF
2
Half-life:
100
36
Kr = 12 ms (β
-
(100%), β
-
n )
69
36
Kr = 28 ms (β
+
(100%), β
+
p (55%))
70
36
Kr = 52 ms (β
+
(100%))
71
36
Kr = 100 ms (β
+
(100%), β
+
p (2.1%))
72
36
Kr = 17.16 s (β
+
(100%))
73
36
Kr = 27.3 s (β
+
(100%), β
+
p (0.25%))
73m
36
Kr = 107 ns (internal transition (100%))
74
36
Kr = 11.50 min (β
+
(100%))
75
36
Kr = 4.60 min (β
+
(100%))
76
36
Kr = 14.8 h (β
+
(100%))
77
36
Kr = 74.4 min (β
+
(100%))
77m
36
Kr = 118 ns (internal transition (100%))
78
36
Kr = stable ( (isotopic abundance 0,355%))
79
36
Kr = 35.04 h (β
+
(100%))
79m
36
Kr = 50 s (internal transition (100%))
80
36
Kr = stable ( (isotopic abundance 2,286%))
81
36
Kr = 229 000 y (electron capture (100%))
81m
36
Kr = 13.10 s (internal transition (100%))
82
36
Kr = stable ( (isotopic abundance 11,593%))
83
36
Kr = stable ( (isotopic abundance 11,5%))
83m
36
Kr = 156.8 ns (internal transition (100%))
83n
36
Kr = 1.830 h (internal transition (100%))
84
36
Kr = stable ( (isotopic abundance 56,987%))
84m
36
Kr = 1.83 μs (internal transition (100%))
85
36
Kr = 10.739 y (β
-
(100%))
85m
36
Kr = 4.480 h (β
-
(78.8%), internal transition (21.2%))
85n
36
Kr = 1.82 μs (internal transition (100%))
86
36
Kr = stable ( (isotopic abundance 17,279%))
87
36
Kr = 76.3 min (β
-
(100%))
88
36
Kr = 2.825 h (β
-
(100%))
89
36
Kr = 3.15 min (β
-
(100%))
90
36
Kr = 32.32 s (β
-
(100%))
91
36
Kr = 8.57 s (β
-
(100%))
92
36
Kr = 1.840 s (β
-
(100%), β
-
n (0.0332%))
93
36
Kr = 1.286 s (β
-
(100%), β
-
n (1.95%))
94
36
Kr = 212 ms (β
-
(100%), β
-
n (1.11%))
95
36
Kr = 114 ms (β
-
(100%), β
-
n (2.87%))
96
36
Kr = 80 ms (β
-
(100%), β
-
n (3.7%))
97
36
Kr = 62.2 ms (β
-
(100%), β
-
n (6.7%))
98
36
Kr = 42.8 ms (β
-
(100%), β
-
n (7.0%))
99
36
Kr = 40 ms (β
-
(100%), β
-
n (11%))
Vapour pressure (Torr):
1 (-198.3°C)
10 (-187.2°C)
100 (-172.4°C)
Permittivity (dielectric constant):
1.000768 (25°C)
Speed sound (m/s):
224.4 (30.3°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)):
163.97 (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):
1.64
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
9.05
Critical temperature (°C):
-63.77
Critical pressure (MPa):
5.5
Critical density (g/cm
3
):
0.908
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 886
Вредные химические вещества: Неорганические соединения элементов V-VIII групп. Справочник. - Л., 1989. - pp. 537 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 25, 75 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 583-586 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 523 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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