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Properties of substance:
cobalt
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Co
Structural formula as text:
Co
Molar/atomic mass: 58.93
Melting point (°C):
1492
Boiling point (°C):
2960
Solubility (g/100 g of solvent):
mercury
: 0.17 (18°C) [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1735
Density:
8.84 (20°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
]
Co
2
(CO)
8
→ 2Co + 8CO
Half-life:
50
27
Co = 38.8 ms (β
+
(100%), β
+
p (70.5%))
51
27
Co = 68.8 ms (β
+
(100%), β
+
p )
52
27
Co = 115 ms (β
+
(100%))
52m
27
Co = 104 ms ()
53
27
Co = 242 ms (β
+
(100%))
53m
27
Co = 247 ms (β
+
(about 98.5%), p (about 1.5%))
54
27
Co = 193.28 ms (β
+
(100%))
54m
27
Co = 1.48 min (β
+
(100%))
55
27
Co = 17.53 h (β
+
(100%))
56
27
Co = 77.236 d (β
+
(100%))
57
27
Co = 271.74 день (electron capture (100%))
58
27
Co = 70.86 d (β
+
(100%))
58m
27
Co = 9.10 h (internal transition (100%))
58n
27
Co = 10.5 μs (internal transition (100%))
59
27
Co = stable ( (isotopic abundance 100%))
60
27
Co = 5.2712 y (β
-
(100%))
60m
27
Co = 10.467 min (internal transition (about 100%), β
-
(0.24%))
61
27
Co = 1.650 h (β
-
(100%))
62
27
Co = 1.54 min (β
-
(100%))
62m
27
Co = 13.86 min (β
-
(about 100%))
63
27
Co = 26.9 s (β
-
(100%))
64
27
Co = 300 ms (β
-
(100%))
65
27
Co = 1.16 s (β
-
(100%))
66
27
Co = 194 ms (β
-
(100%), β
-
n)
66m
27
Co = 1.21 μs (internal transition (100%))
67
27
Co = 329 ms (β
-
(100%), β
-
n)
67m
27
Co = 469 ms (internal transition (> 80%))
68
27
Co = 200 ms (β
-
(100%), β
-
n)
68m
27
Co = 1.6 s (β
-
(100%))
68n
27
Co = 101 ns (internal transition (100%))
69
27
Co = 227 ms (β
-
(100%), β
-
n)
70
27
Co = 112.7 ms (β
-
(100%), β
-
n)
70m
27
Co = 500 ms (β
-
(about 100%))
71
27
Co = 80 ms (β
-
(100%), β
-
n)
72
27
Co = 59.9 ms (β
-
(100%), β
-
n)
73
27
Co = 41 ms (β
-
(100%), β
-
n)
74
27
Co = 30 ms (β
-
(100%), β
-
n)
75
27
Co = 26.5 ms (β
-
(100%), β
-
n)
Vapour pressure (Torr):
0.1 (1313°C)
1 (1471°C)
10 (1677°C)
100 (1940°C)
Electrode potential:
Co
2+
+ 2e
-
→ Co, E = -0.277 V (water, 25°C)
Co
3+
+3e
-
→ Co, E = 0.33 V (water, 25°C)
Co
3+
+ e
-
→ Co
2+
, E = 1.808 V (water, 25°C)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
0 (s)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
0 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
30.04 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
24.81 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
15.5
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
428 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
179.4 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
23 (g)
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
376
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 400
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991 [Russian]
Неорганические синтезы. - Сб. 1. - М.: ИИЛ, 1951. - pp. 10 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 73 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 637 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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