Synonym(s): Sodium azide- 15 N₁ (terminal N ) Empirical Formula: Na 15 NN₂ Linear Formula: (Na + )( 15 N≡NN - ) Formula Weight: 66.00 Boiling Point: 300 °C Melting Point: 275 °C Density: 1.87 g/mL at 25 °C