Thermal Properties of Promethium and Tantalum
Specific Heat
0.18 J/(kg K)
  
33
0.14 J/(kg K)
  
37
Molar Heat Capacity
Not Available
  
25.36 J/mol·K
  
99+
Thermal Conductivity
17.90 W/m·K
  
99+
57.50 W/m·K
  
27
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
9.00 µm/(m·K)
  
99+
6.30 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
Not Available
  
753.10 kJ/mol
  
2
Enthalpy of Fusion
7.50 kJ/mol
  
99+
31.40 kJ/mol
  
3
Enthalpy of Atomization
310.00 kJ/mol
  
34
782.00 kJ/mol
  
3
Standard Molar Entropy
Not Available
  
41.50 J/mol.K
  
37