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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/cm3)

Half-life:

16176Os = 640 μs (α (about 100%))
16276Os = 2.1 ms (α (100%))
16376Os = 5.5 ms (α (about 100%))
16476Os = 21 ms ()
16576Os = 71 ms (α (90%))
16676Os = 213 ms (α (72%), β+ (28%))
16776Os = 839 ms (α (51%))
167m76Os = 672 ns (internal transition (100%))
16876Os = 2.1 s (β+ (57%), α (43%))
16976Os = 3.46 s (β+ (86.3%), α (13.7%))
17076Os = 7.37 s ()
17176Os = 8.3 s ()
17276Os = 19.2 s ()
17376Os = 22.4 s (β+ (about 100%), α (0.4%))
17476Os = 44 s (β+ (about 100%), α (0.024%))
17576Os = 1.4 min (β+ (100%))
17676Os = 3.6 min (β+ (100%))
17776Os = 3.0 min (β+ (100%))
17876Os = 5.0 min (β+ (100%))
17976Os = 6.5 min (β+ (100%))
179m76Os = 500 ns (internal transition (100%))
179n76Os = 783 ns (internal transition (100%))
18076Os = 21.5 min (β+ (100%))
18176Os = 105 min (β+ (100%))
181m76Os = 2.7 min (β+ (100%))
181n76Os = 262 ns (internal transition (100%))
18276Os = 21.84 hasа (electron capture (100%))
182m76Os = 780 μs (internal transition (100%))
182n76Os = 150 ns (internal transition (100%))
18376Os = 13.0 h (β+ (100%))
183m76Os = 9.9 h (β+ (85%), internal transition (15%))
18476Os = stable ( (isotopic abundance 0,02%))
18576Os = 92.95 d (electron capture (100%))
185m76Os = 3.0 μs (internal transition (100%))
185n76Os = 780 ns (internal transition (100%))
18676Os = 2 · 1015 y (α (100%) (isotopic abundance 1,59%))
18776Os = stable ( (isotopic abundance 1,96%))
187m76Os = 112 ns (internal transition (100%))
187n76Os = 231 μs (internal transition (100%))
18876Os = stable ( (isotopic abundance 13,24%))
18976Os = stable ( (isotopic abundance 16,15%))
189m76Os = 5.81 hasа (internal transition (100%))
19076Os = stable ( (isotopic abundance 26,26%))
190m76Os = 9.86 min (internal transition (100%))
19176Os = 14.99 d (β- (100%))
191m76Os = 13.10 hasа (internal transition (100%))
19276Os = stable ( (isotopic abundance 40,78%))
192m76Os = 5.9 s (internal transition (> 87%))
192n76Os = 204 ns (internal transition (100%))
19376Os = 29.830 hasа (β- (100%))
193m76Os = 132 ns (internal transition (100%))
19476Os = 6.0 y (β- (100%))
19576Os = 6.5 min ()
195m76Os = 2.0 hasа ()
19676Os = 34.9 min (β- (100%))
19776Os = 2.8 min (β- (100%))
19976Os = 6 s (β- (100%))
20076Os = 7 s (β- (100%))

Vapour pressure (Torr):

1 (3240°C)
10 (3630°C)
100 (4110°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

0 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

0 (s)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

32.6 (s)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

24.7 (s)

Molar enthalpy (heat) of fusion ΔfusH (kJ/mol):

31.8

Enthalpy (heat) of vaporization ΔvapH (kJ/mol):

749

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

790 (g)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

192.5 (g)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

20.8 (g)

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 400-406 [Russian]
  2. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
  3. 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