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Properties of substance:

iridium


Physical appearance:

cubic metal

Empirical formula (Hill's system):

Ir

Structural formula:

Ir

Molar/atomic mass: 192.22

Melting point (°C):

2450

Boiling point (°C):

4380

Solubility (g/100 g of solvent):

water: insoluble
mercury: insoluble

Properties:

Superconducting temperature (K): 0.1

Density:

22.562 (20°C, g/cm3)

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
    2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 66
    3. Химическая энциклопедия. - Т.2. - М.: Советская энциклопедия, 1990. - pp. 272-273
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru