Thermal Properties of Promethium and Lanthanum
Specific Heat
0.18 J/(kg K)
  
33
0.19 J/(kg K)
  
32
Molar Heat Capacity
Not Available
  
27.11 J/mol·K
  
21
Thermal Conductivity
17.90 W/m·K
  
99+
13.40 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
12.10 µm/(m·K)
  
32
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
399.60 kJ/mol
  
17
Enthalpy of Fusion
7.50 kJ/mol
  
99+
6.20 kJ/mol
  
99+
Enthalpy of Atomization
310.00 kJ/mol
  
34
431.00 kJ/mol
  
16
Standard Molar Entropy
Not Available
  
56.90 J/mol.K
  
23