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Properties of substance:

actinium

Group of substances:

inorganic

Physical appearance:

cubic metal

Empirical formula (Hill's system for organic substances):

Ac

Structural formula as text:

Ac

Molar/atomic mass: 227

Melting point (°C):

1050

Boiling point (°C):

3590

Solubility (g/100 g of solvent):

water: reaction [Ref.]

Numerical data:

Year of discovery: 1899

Density:

10.07 (20°C, g/cm3)

Electrode potential:

Ac3+ + 3e- → Ac, E = -2.6 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)):

56 (s)

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

27 (s)

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

12

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

378

References:

  1. Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 1
  2. Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
  3. Каралова З.К., Мясоедов Б.Ф. Актиний. - М.: Наука, 1982 [Russian]
  4. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52 [Russian]
  5. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 20 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru