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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/cm3)

Reactions:

  1. [Ref.1, Ref.2aster]
    Ir + 3F2 → IrF6

Vapour pressure (Torr):

0.01 (2297°C)
0.1 (2525°C)
1 (2810°C)
10 (3160°C)
100 (3625°C)

Electrode potential:

Ir3+ + 3e- → Ir, E = 1.15 V (water, 25°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)):

35.48 (s)

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

25.1 (s)

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

26.4

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

612.5

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

670 (g)

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

193.5 (g)

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

20.8 (g)

References:

  1. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
  2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 66 [Russian]
  3. Химическая энциклопедия. - Т. 2. - М.: Советская энциклопедия, 1990. - pp. 272-273 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru