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Properties of substance:

americium

Group of substances:

inorganic

Physical appearance:

metal

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

Am

Structural formula as text:

Am

Molar/atomic mass: 243

Melting point (°C):

1173

Boiling point (°C):

2607

Solubility (g/100 g of solvent):

ammonia liquid : insoluble [Ref.]

Numerical data:

Year of discovery: 1944

Density:

13.67 (20°C, g/cm3)

Electrode potential:

Am3+ + 3e- → Am, E = -2.07 V (water, 25°C)
Am4+ + 4e- → Am, E = -0.9 V (water, 25°C)
Am4+ + e- → Am3+, E = 2.181 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)):

54.84 (s)

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

25.85 (s)

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

1437

References:

  1. Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 15
  2. Вредные химические вещества: Радиоактивные вещества. Справочник. - Л., 1990. - pp. 208-209 [Russian]
  3. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 125-126 [Russian]
  4. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 32 [Russian]
  5. Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 407-422 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru