476 DIAZO COMPOUNDS AND OTHERS. 



2. The following reaction 



C 2 Ag0 4 = 2C0 2 + Ag 2 , 



corresponds to 304 grins, of the substance. 



3. It liberates + 29'5 Cal. for 1 equiv., or + 97 Cal. for 1 kgm. 



4. The reduced volume of the gases is 44'6 litres for 1 equiv., 

 or 114 litres for 1 kgm. 



114 atm. 



5. The permanent pressure = fwv?* W1 ^ n * e usuai 



reservation. 



712 atm. 



6. The theoretical pressure = T-TJ. 



n 0*06 



This pressure is much less than that of the explosives 

 hitherto examined. However, owing to the great density of 

 the salt, it would be nearly quadrupled, if the latter exploded 

 in its own volume, which accounts for the shattering character 

 of the compound. 



12. MERCURY OXALATE. 



1. This is a white, heavy, hard powder, which does not 

 explode by shock, but which explodes feebly by heating. 



2. The reaction 



C 2 Hg0 4 = 2CO S + Hg, 



corresponds to 288 grms. of matter. 



3. It liberates + 17 '3 Cal. per equivalent (liquid mercury), 

 or + 1-9 Cal. (gaseous mercary) ; or. for 1 kgm., + 60 Cal., or 

 6-6 Cal. 



4. The reduced volume of the gases is, for 1 equiv., 44'6 litres 

 (liquid mercury), or 6 6 '9 litres (gaseous mercury) ; or, for 1 kgm., 

 155 litres, or 227 litres. 



5. The permanent pressure = -s^r-j with the usual 



n - 0'05 

 reservation. 



6. Theoretical presure = 300 atm ' 



n 



This pressure is very small compared with the other explosive 

 substances, which explains why mercury oxalate explodes so 

 feebly, and why the mixture of mercury oxalate with the 

 fulminate, which is produced when the manufacture is 

 defective, greatly lessens the properties of the fulminate. 



