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Properties of substance:
osmium
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Os
Structural formula as text:
Os
Molar/atomic mass: 190.2
Melting point (°C):
3027
Boiling point (°C):
5000
Solubility (g/100 g of solvent):
mercury
: insoluble [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1803
Superconducting temperature (K): 0.66
Density:
22.587 (20°C, g/cm
3
)
Half-life:
161
76
Os = 640 μs (α (about 100%))
162
76
Os = 2.1 ms (α (100%))
163
76
Os = 5.5 ms (α (about 100%))
164
76
Os = 21 ms ()
165
76
Os = 71 ms (α (90%))
166
76
Os = 213 ms (α (72%), β
+
(28%))
167
76
Os = 839 ms (α (51%))
167m
76
Os = 672 ns (internal transition (100%))
168
76
Os = 2.1 s (β
+
(57%), α (43%))
169
76
Os = 3.46 s (β
+
(86.3%), α (13.7%))
170
76
Os = 7.37 s ()
171
76
Os = 8.3 s ()
172
76
Os = 19.2 s ()
173
76
Os = 22.4 s (β
+
(about 100%), α (0.4%))
174
76
Os = 44 s (β
+
(about 100%), α (0.024%))
175
76
Os = 1.4 min (β
+
(100%))
176
76
Os = 3.6 min (β
+
(100%))
177
76
Os = 3.0 min (β
+
(100%))
178
76
Os = 5.0 min (β
+
(100%))
179
76
Os = 6.5 min (β
+
(100%))
179m
76
Os = 500 ns (internal transition (100%))
179n
76
Os = 783 ns (internal transition (100%))
180
76
Os = 21.5 min (β
+
(100%))
181
76
Os = 105 min (β
+
(100%))
181m
76
Os = 2.7 min (β
+
(100%))
181n
76
Os = 262 ns (internal transition (100%))
182
76
Os = 21.84 hasа (electron capture (100%))
182m
76
Os = 780 μs (internal transition (100%))
182n
76
Os = 150 ns (internal transition (100%))
183
76
Os = 13.0 h (β
+
(100%))
183m
76
Os = 9.9 h (β
+
(85%), internal transition (15%))
184
76
Os = stable ( (isotopic abundance 0,02%))
185
76
Os = 92.95 d (electron capture (100%))
185m
76
Os = 3.0 μs (internal transition (100%))
185n
76
Os = 780 ns (internal transition (100%))
186
76
Os = 2 · 10
15
y (α (100%) (isotopic abundance 1,59%))
187
76
Os = stable ( (isotopic abundance 1,96%))
187m
76
Os = 112 ns (internal transition (100%))
187n
76
Os = 231 μs (internal transition (100%))
188
76
Os = stable ( (isotopic abundance 13,24%))
189
76
Os = stable ( (isotopic abundance 16,15%))
189m
76
Os = 5.81 hasа (internal transition (100%))
190
76
Os = stable ( (isotopic abundance 26,26%))
190m
76
Os = 9.86 min (internal transition (100%))
191
76
Os = 14.99 d (β
-
(100%))
191m
76
Os = 13.10 hasа (internal transition (100%))
192
76
Os = stable ( (isotopic abundance 40,78%))
192m
76
Os = 5.9 s (internal transition (> 87%))
192n
76
Os = 204 ns (internal transition (100%))
193
76
Os = 29.830 hasа (β
-
(100%))
193m
76
Os = 132 ns (internal transition (100%))
194
76
Os = 6.0 y (β
-
(100%))
195
76
Os = 6.5 min ()
195m
76
Os = 2.0 hasа ()
196
76
Os = 34.9 min (β
-
(100%))
197
76
Os = 2.8 min (β
-
(100%))
199
76
Os = 6 s (β
-
(100%))
200
76
Os = 7 s (β
-
(100%))
Vapour pressure (Torr):
1 (3240°C)
10 (3630°C)
100 (4110°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)):
32.6 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
24.7 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
31.8
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
749
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
790 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
192.5 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.8 (g)
References:
Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 400-406 [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. 89 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
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