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Properties of substance:
iridium
Group of substances:
inorganic
Physical appearance:
cubic metal
Empirical formula (Hill's system for organic substances):
Ir
Structural formula as text:
Ir
Molar/atomic mass: 192.22
Melting point (°C):
2450
Boiling point (°C):
4380
Solubility (g/100 g of solvent):
mercury
: insoluble [
Ref.
]
toluene
: insoluble [
Ref.
]
water
: insoluble [
Ref.
]
Numerical data:
Year of discovery: 1804
Superconducting temperature (K): 0.1
Density:
22.562 (20°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
Ir + 3F
2
→ IrF
6
Vapour pressure (Torr):
0.01 (2297°C)
0.1 (2525°C)
1 (2810°C)
10 (3160°C)
100 (3625°C)
Electrode potential:
Ir
3+
+ 3e
-
→ Ir, E = 1.15 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)):
35.48 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
25.1 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
26.4
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
612.5
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
670 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
193.5 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.8 (g)
References:
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 66 [Russian]
Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 272-273 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru