Energy of decomposition

The kinetic stability of pentazole has been estimated by the activation energy of decomposition or retro-[3 -i- 2]-cycloaddition reaction of 19.8 kcal moL [107] and 19.5 kcal mol- [108] with a half-life of only 14 s at 298 K [108]. 

A bearing assembly from a sodium bromate crusher had been degreased at 120°C, and while still hot the sleeve was hammered to free it. The assembly exploded violently, probably because of the presence of a hot mixture of sodium bromate and a grease component (possibly a sulfurised derivative). It is known that mixtures of bromates and organic or sulfurous matter are heat- and friction-sensitive [1]. The energy of decomposition of the likely components has been calculated as 1.93 kJ/g, with an explosion temperature above 2000°C [2],... 

See entry THERMOCHEMISTRY AND exothermic decomposition (reference 2) It may ignite in moist air. Hazardous properties and handling procedures are summarised [1]. Energy of decomposition (in range 410-460 °C) measured as 0.77 kJ/g [2],... 

Energy of decomposition (in range 160-230°C) measured as 1.36 kJ/g by DSC, and Tajt24 was determined as 120°C by adiabatic Dewar tests, with an apparent energy of activation of 131 kJ/mol. 

It is extremely explosive and must be handled with utmost care. Explosions during synthesis (100 mmol, 8.1 g) wrecked a ventilated hood. (The energy of decomposition of this endothermic acetylenic azide probably exceeds 250 kJ/mol, 3 kJ/g.)... 

Both isomers were stored as frozen solids, for as liquids they are more explosive than the hexafluoro Dewar benzene analogue [1]. Energy of decomposition (320-540°C) was determined by DSC as 4.60 kJ/g. 

---