Promethium
Thermodynamic properties
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Δ
f
H
°
atomization
(kJ/mol):
301 [1]
Δ
f
H
°
solid
(kJ/mol):
0.0 [3]
S
°
gas
(J/mol·K):
187.1 [3]
C
p
(gas)
(J/mol·K):
24.3 (25 °C) [3]
Coeff. of linear thermal expansion (10
6
K
-1
):
11 (25 °C) [3]
