420 NITRIC ETHERS PROPERLY SO CALLED. 



3. NlTRO-METHYLIC ETHER : 



1. Equivalent, 77. 



2. Composition 



C = 156 



H = 39 



N = 182 



= 623 



1000 



3. This body is liquid, boiling at 66. 



4. Density at 20 : 1182. 



5. This ether can be inflamed in small quantities at the 

 ordinary temperature, but its vapour, superheated to about 150, 

 explodes violently. It may even explode cold, on contact with 

 a flame, 1 and communicate the explosion to liquid ether. 



6. Heat of formation from the elements (p. 284) 



C (diamond) + H 3 + N + 3 = CH 2 (N0 3 H) (liquid) + 39'6 Cal. 



7. The ether being gaseous, this figure must be nearly + 32. 

 The heat of total combustion of the liquid body, + 157'9. 



8. Admitting the following decomposition 



2CH 2 (N0 3 H) = C0 2 + CO + 3H 2 + N 2 , 



the heat liberated at constant pressure would be, the ether being 

 liquid, the water gaseous, +113 Cal. at constant pressure, 

 + 114 Cal. at constant volume; the ether and water being 

 both liquid, + 123*8 Cal., or for 1 kgm. 1605. 



All the other bodies being gaseous the heat liberated remains 

 nearly the same. 



9. The volume of the permanent gases for 1 equiv., 33*5 litres 

 /. t \ / t \ 



\ * 273/' the Water S aseous 66 ' 9 lltres V 1 + 273J ;or ' for 



1 kgm., for the permanent gases 435 litres (I + 070)' wnen 



the water is gaseous 869 litres (l + ^=^ 



10. Theoretical temperature at constant volume 



4S 5 ""*- 



11. Permanent pressure, at (the liquid water occupying 

 351 c.c.) 



435 atm. 448 kgm. 

 or 



n - 0-351 n - 0:351 

 This value is applicable only to low densities of charge, that 

 1 Explosion at Saint-Denis, November 19, 1874. 



