Explosion Formation Heat of Explosive

The calculation of explosion heat of explosive involves its formation heat, therefore, its explosion heat not only depends on element composition of the explosive, 

Formation heat is expressed with — A//f or Qi usually and their relationship is 

Formation heat is a basic parameter in the thermochemical calculation, which can be calculated from combustion heat of a compound according to Hess s law. The measurement accuracy of combustion heat has reached a very high level. In the design of a new explosive, in order to know its explosion properties and thermochemical properties, its formation heat can be calculated first, which is necessary to design and decide the formulation of explosive. 

When any substituent is introduced in hydrocarbon molecules to saturate double bond or triple bond, the electronic structure of molecule will be changed, thus the thermal effect of electron transfer of 1 mol atom will have some change. According to the impact of change in molecule structure, the explosion heat of explosive can be calculated based on the corresponding corrected thermochemical data of some groups and the corrected data are listed in Table 3.9. The combustion heat of CaHi,OcN compounds under constant pressure can be calculated as the following equation  

1 Sulfur-containing groups in aromatic hydrocarbon Ar-SOsH -98 

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