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Properties of substance:
radium
Group of substances:
inorganic
Physical appearance:
cubic metal
Empirical formula (Hill's system for organic substances):
Ra
Structural formula as text:
Ra
Molar/atomic mass: 226.0254
Melting point (°C):
969
Boiling point (°C):
1507
Solubility (g/100 g of solvent):
water
: reaction [
Ref.
]
Numerical data:
Year of discovery: 1898
Ionization Potentials (Electronvolts): 5.277
Ionization Potentials (Electronvolts): 10.144
Density:
6 (20°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
Ra + 2H
2
O → Ra(OH)
2
+ H
2
Electrode potential:
Ra
2+
+ 2e
-
→ Ra, E = -2.8 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)):
69.1 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
29.3 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
8
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
149.6
ΔH
sublimation
(kJ/mol):
157.9
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
162 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
176.3 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
20.786 (g)
References:
Бекман И.Н. Радиохимия. Том II: Радиоактивные элементы. - М.: Издатель Мархитин П.Ю., 2014. - pp. 94-107 [Russian]
Вдовенко В.М., Дубасов Ю.В. Аналитическая химия радия. - Л.: Наука, 1973. - pp. 24-25 [Russian]
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Краткая химическая энциклопедия. - Т. 4: Пирометаллургия-С. - М.: Советская энциклопедия, 1965. - pp. 435-438 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 91 [Russian]
Рипан Р., Четяну И. Неорганическая химия. - Т.1. - М.: Мир, 1971. - pp. 259-260 [Russian]
Химическая энциклопедия. - Т. 4. - М.: Советская энциклопедия, 1995. - pp. 153-154 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru