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Properties of substance:
lanthanum
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
La
Structural formula as text:
La
Molar/atomic mass: 138.91
Melting point (°C):
920
Boiling point (°C):
3950
Solubility (g/100 g of solvent):
gallium
: 1 (500°C) [
Ref.
]
mercury
: 0.0045 (0°C) [
Ref.
]
mercury
: 0.0096 (25°C) [
Ref.
]
mercury
: 0.0171 (50°C) [
Ref.
]
water
: reaction [
Ref.
]
Numerical data:
Year of discovery: 1839
Superconducting temperature (K): 4.88 (α-form)
Superconducting temperature (K): 6 (β-form)
Density:
6.16 (20°C, g/cm
3
)
Vapour pressure (Torr):
1 (2156°C)
10 (2474°C)
100 (2387°C)
Electrode potential:
La
3+
+ 3e
-
→ La, E = -2.522 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)):
57.3 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
27.6 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
6.7
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
413
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
430 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
182.3 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
22.8 (g)
References:
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 887
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 72-73 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 75 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 595 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru