414 DEFINITE NON-CARBURETTED EXPLOSIVE COMPOUNDS. 



monium nitrate, as typical in the study of explosive substances ; 

 this multiplicity of simple reactions not being known, generally 

 speaking, with precision, for the other bodies. It will be noticed 

 with regard to this point that in the explosive decompositions of 

 this salt, the heat at constant volume may vary from + 351 Cal. 



to 11*2 Cal. ; the volume of the gases, from 62*5 litres ( 1 -f- ~^o 



/ t \ ^ * 1 



to 78-1 litres 



7. AMMONIUM PERCHLOHATE : C10 4 H, NH 3 . 



1. Equivalent, 117-5. 



2. Composition 



Cl ... .. .......... = 302 



N ............... = 119 



H ...... ;., ^ ... = 34 



,,. .<* ......... = 545 



1000 



3. Heat of formation from the elements 



Cl + N + H 4 + 4 = C10 4 H, NH 3 + 797. 



4. The decomposition of this salt by heat has already been 

 studied (p. 356). The principal reaction is C10 4 H, NH 3 (solid) 

 = Cl + O 2 + N + 2Hj,0 (gaseous) + 38*3 Cal. ; the water being 

 liquid, + 58 ; or, for 1 kgm., 4963 Cal. 



At constant volume we should have, -h 59 '5 Cal., the water 

 being liquid, and -f- 40 '7, the water being gaseous. 



5. This reaction produces at the temperature t } the water 



being supposed liquid, 44'6 litres M -f - ) ; the water 



\ 273/ 



gaseous, 89'3 litres ^1 + J; of, for one kgm., 379'6 litres 



(l + ^|)i the water being liquid, and 759*2 litres (l + -~^ t 



the water gaseous. 



6. Theoretical temperature at constant volume, 



40700 - 1563 

 ~2W' 



7. The permanent pressure at 0, for a density of charge , 



taking into account the volume of the liquid water (307 c.c. for 

 1 kgm.), would be 



379-6 atm> 392 kgm. 



n - 0-307 1% n - 0'307 



