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Properties of substance:
molybdenum
Group of substances:
inorganic
Physical appearance:
cubic metal
Empirical formula (Hill's system for organic substances):
Mo
Structural formula as text:
Mo
Molar/atomic mass: 95.94
Melting point (°C):
2620
Boiling point (°C):
4630
Solubility (g/100 g of solvent):
lithium molten
: 0.0007 (700°C) [
Ref.
]
mercury
: 0.00002 (20°C) [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1781
Superconducting temperature (K): 0.92
Density:
10.22 (20°C, g/cm
3
)
Reactions of synthesis:
[
Ref.1
]
MoO
3
+ 3H
2
→ Mo + 3H
2
O
Yeild 90%. [
Ref.1
]
3MoO
2
+ 4Al → 3Mo + 2Al
2
O
3
Reactions:
[
Ref.1
,
Ref.2
]
Mo + 3F
2
→ MoF
6
Half-life:
100
42
Mo = 7.1 · 10
18
y (2β
-
(100%) (isotopic abundance 9,82%))
101
42
Mo = 14.61 min (β
-
(100%))
101m
42
Mo = 226 ns (internal transition (100%))
101n
42
Mo = 133 ns (internal transition (100%))
102
42
Mo = 11.3 min (β
-
(100%))
103
42
Mo = 67.5 s (β
-
(100%))
104
42
Mo = 60 s (β
-
(100%))
105
42
Mo = 35.6 s (β
-
(100%))
106
42
Mo = 8.73 s (β
-
(100%))
107
42
Mo = 3.5 s (β
-
(100%))
107m
42
Mo = 420 ns (internal transition (100%))
108
42
Mo = 1.105 s (β
-
(100%), β
-
n (< 0.5%))
109
42
Mo = 700 ms (β
-
(100%), β
-
n (1.3%))
109m
42
Mo = 210 ns (internal transition (100%))
110
42
Mo = 292 ms (β
-
(100%), β
-
n (2.0%))
111
42
Mo = 193.6 ms (β
-
(100%), β
-
n (< 12%))
111m
42
Mo = 200 ms (β
-
(100%), β
-
n )
112
42
Mo = 125 ms (β
-
(100%), β
-
n)
113
42
Mo = 80 ms (β
-
(100%), β
-
n)
114
42
Mo = 58 ms (β
-
(100%), β
-
n)
115
42
Mo = 45.5 ms (β
-
(100%), β
-
n. β
-
2n)
116
42
Mo = 32 ms (β
-
(100%), β
-
n. β
-
2n)
117
42
Mo = 22 ms (β
-
(100%), β
-
n. β
-
2n)
118
42
Mo = 21 ms (β
-
(100%), β
-
n. β
-
2n)
83
42
Mo = 23 ms (β
+
(100%))
84
42
Mo = 2.3 s (β
+
(100%))
85
42
Mo = 3.2 s (β
+
(100%), β
+
p (0.14%))
86
42
Mo = 19.1 s (β
+
(100%))
87
42
Mo = 14.1 s (β
+
(100%), β
+
p (15%))
88
42
Mo = 8.0 min (β
+
(100%))
89
42
Mo = 2.11 min (β
+
(100%))
89m
42
Mo = 190 ms (internal transition (100%))
90
42
Mo = 5.56 h (β
+
(100%))
90m
42
Mo = 1.12 μs (internal transition (100%))
91
42
Mo = 15.49 min (β
+
(100%))
91m
42
Mo = 64.6 s (β
+
(50%), internal transition (50%))
92
42
Mo = stable ( (isotopic abundance 14,53%))
92m
42
Mo = 190 ns (internal transition (100%))
93
42
Mo = 4 000 y (electron capture (100%))
93m
42
Mo = 6.85 h (internal transition (about 100%), β
+
(0.12%))
93n
42
Mo = 1.8 μs ()
94
42
Mo = stable ( (isotopic abundance 9,15%))
95
42
Mo = stable ( (isotopic abundance 15,84%))
96
42
Mo = stable ( (isotopic abundance 16,67%))
97
42
Mo = stable ( (isotopic abundance 9,6%))
98
42
Mo = stable ( (isotopic abundance 24,39%))
99
42
Mo = 65.976 h (β
-
(100%))
99m
42
Mo = 15.5 μs (internal transition (100%))
99n
42
Mo = 760 ns (internal transition (100%))
Vapour pressure (Torr):
0.01 (2525°C)
0.1 (2775°C)
1 (3107°C)
10 (3540°C)
100 (4115°C)
Electrode potential:
Mo
3+
+ 3e
-
→ Mo, E = -0.2 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)):
28.6 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
24.1 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
36.4
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
582.4
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 1014
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Зеликман А.Н. Молибден. - М.: Металлургия, 1970. - pp. 387-395 [Russian]
Моргунова Н.Н., Клыпин Б.А., Бояршинов В.А., Тараканов Л.А., Манегин Ю.В. Сплавы молибдена. - М.: Металлургия, 1975 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 81 [Russian]
Редкие и рассеянные элементы. Химия и технология. - Кн. 2. - М.: Мисис, 1998. - pp. 368-373 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 617 [Russian]
Химия и технология редких и рассеянных элементов. - Ч. 3. - М.: Высшая школа, 1976. - pp. 159-162 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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