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Properties of substance:
praseodymum
Group of substances:
inorganic
Physical appearance:
hexagonal metal
Empirical formula (Hill's system for organic substances):
Pr
Structural formula as text:
Pr
Molar/atomic mass: 140.91
Melting point (°C):
932
Boiling point (°C):
3510
Solubility (g/100 g of solvent):
mercury
: 0.013 (20°C) [
Ref.
]
Numerical data:
Year of discovery: 1885
Density:
6.77 (20°C, g/cm
3
)
Electrode potential:
Pr
3+
+ e
-
→ Pr
2+
, E = -3.1 V (water, 25°C)
Pr
3+
+ e
-
→ Pr, E = -2.353 V (water, 25°C)
Pr
2+
+ e
-
→ Pr, E = -2 V (water, 25°C)
Pr
4+
+ e
-
→ Pr
3+
, E = 3.2 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)):
73.6 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
28.5 (s)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
356 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
189.7 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
21.4 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
6.9
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
297
References:
Handbook of Chemistry and Physics. - CRC Press, Inc., 2002
Гурвич Я.А. Справочник молодого аппаратчика-химика. - М.: Химия, 1991. - pp. 51 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 91 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru