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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/cm
3
)
Electrode potential:
Ac
3+
+ 3e
-
→ Ac, E = -2.6 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)):
56 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
12
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
378
References:
Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 1
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 50 [Russian]
Каралова З.К., Мясоедов Б.Ф. Актиний. - М.: Наука, 1982 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52 [Russian]
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