HYPOCHLOEOUS ACID, NITRIC OXIDE, ACETYLENE. 385 



The heat liberated is always the same for a given weight of 

 ozone, but it is distributed between the oxygen derived from it, 

 and the excess of the same gas which pre-existed. Consequently, 

 the temperature produced at constant volume will be 245, and 

 the pressure developed about 1*9 atm. 



4. Hypochlorous acid explodes under the influence of a tem- 

 perature above 60, or under the influence of a spark, shock, etc. 



Thus it liberates 7*6 Gal. by C1 2 = 43*5 grms., occupying 

 1T6 lit. or 15'2 Cal. for the molecular weight (87 grms.). 

 C1 2 O = C1 2 + O liberates 15 -2 Cal. at constant pressure, or 

 175 cal. per gramme of substance. 



The specific heat of being 3'5 and that of C1 2 8 '6, the sum 

 is 12 i l at constant pressure, and the temperature developed in 

 the final mixture of the elements in consequence of their sepa- 

 ration will be then ' = 1256. 

 \.2t' J. 



At constant volume the sum of the specific heats of the 

 elements is reduced to lO'l, and the heat developed rises to 

 15'5 Cal. The temperature produced rises then to 1530, and 

 the pressure calculated to 9*9 atm. 



5. It has been deemed useful to give these results, since they 

 are typical, owing to the gaseous character of the components 

 and products and the elementary nature of the latter. From 

 the same point of view, it is also interesting to mention the 

 explosions of nitric oxide, acetylene, and cyanogen, although 

 they only take place under the influence of mercury fulminate. 



6. The decomposition of nitric oxide into elements, as it is 

 brought about by fulminate (p. 72), becomes complicated, owing 

 to the combustion of carbonic oxide produced by the detonation. 

 If it could be produced isolated, it would develop less pressure 

 than pure ozone. In fact, we arrive at the following figures : 

 Heat liberated, 



Q = -f 21-6 Cal. for NO (30 grms.) ; 

 temperature developed at constant volume, 



t = 4204 ; 

 pressure produced, 



p = 16*4 atm. 



7. The detonation of acetylene, also induced by fulminate 

 (p. 69), gives rise to the following effects : 



Heat liberated, 



Q = 61 Cal. for C 2 H (26 grms.) ; 

 temperature developed at constant volume, 



t = 6220; 

 pressure produced, 



p = 23-8 atm. 



2c 



