HTTBIC ACID AND yiTBOBEHZEXE. 473 



benzene. We will now give the theoretical calculations for the 

 combustion of these two mixtures, including dinitrobenzene. 



7. NITRIC Aero ASD PICRIC Aero. 



1. The reaction corresponding to total combustion is, 

 SCtH^NOJaQ + 13HNO 3 = 30CO, + 14H 1 + 28N. 



2. The proportions by weight are, 229 grms. of picric acid to 

 164 grms. of nitric acid ; in all, 393 grms. ; or, per kilogramme, 

 583 grm. of picric acid and 417 grms. of nitric acid. 



3. The heat liberated will be, for 1 equiv., 318 CaL (liquid 

 water), or 290 CaL (gaseous water) ; or, for 1 kgm., 809 litres, or 

 738 CaL 



4 The reduced volume of the gases, for 1 equiv., 500 litres, or 

 659 litre*, 



5. The permanent pressure = - rr, with the usual reser- 



n 0*1.3 



vation of the limit of liquefaction of carbonic acid. 



9450 atm. 



6. The theoretical pressure = -- 



n 



No experiment has been made with the object of directly 

 measuring the heat, the volume of the gases, or the pressure ; 

 a remark which is equally applicable to the following mixtures. 



8. NITRIC ACID ASD 



1. The reaction of total combustion i 



CH*NO 2 + 5HNO, = 6CO, + 5H,O + 6X. 



2. The proportions by weight are, 123 grms. nitrobenzene to 

 315 grms. nitric acid ; in all, 438 grms. ; or, for 1 kgm., 719 grms. 

 acid and 281 grms. nitrobenzene. It will be borne in mind 

 that the nitrobenzene is liquid. 



3. The heat liberated 1 will be, for 1 equiv., 415 CaL (liquid 

 water), or 365 CaL (gaseous water); or, for I kgm., 947 CaL, or 

 834 CaL 



4 The reduced volume of the gases, for 1 equiv., 201 litres 

 (liquid water), 373 litres (gaseous water) ; or, for 1 kgm., 459 

 litres, or 714 litres. 



5. The permanent pressure = - 7 r 7r r f with the usual reser- 



n 

 vation. 



a , ., _ ^ . 10700 atm. 



6. The theoretical pressure = 



