HEAT OF COMBUSTION OF TKIMETHYLAMINE. 



255 



weights of gaseous ethylamine, equal respectively to 2*555 

 grms. and 2*415 grms., and dissolved in 400 grms. of water 

 gave for C 2 H 7 ]Sr (45 grms.); + 12*92 and + 12*90 ; mean 12*91 

 Cal. These results exceed those of ammonia by one-half. 

 6. Formation of salts in solution at 190. 



C 2 H 7 N (1 eq. = 7 litres) + HC1 (1 eq. = 2 litres) liberates -f 13-2 

 + C 2 HA 4-12-9 



+ H 2 S0 4 4-15-2 



figures that are intermediate between those given .by potash and 

 ammonia. 



Third Section. Trimethylamine. 



1. This is a liquid that boils at 9; it is consequently 

 gaseous at the ordinary temperature. It is ^ery soluble in 

 water and forms well-defined salts. 



2. Analysis. These are the results obtained -by eudiometric 

 analysis : 



TRIMETHYLAMINE. 



3. Heat of combustion of trimethylamine. Three detonations 

 made with weights of the base ranging between 112 grms. and 

 186 grms. gave for C 3 H 9 N (59 grms.), the volume being 

 constant 



2C 3 H 9 lSr + 21 = 6C0 2 gas + 9H 2 O liquid -f N 2 . 



According to the initial weight 586*2, 583*5, 601*1 ; mean 

 + 590*3. 



According to the final weight of the carbonic acid, on an 

 average + 591-7. 



The general mean is + 590*5, which gives for the heat of 

 combustion at a constant pressure -f- 592, with a limit of error 

 of about + 6 Cal., an uncertainty that applies to the following 

 deductions. 



4. Heat of formation. 



From the elements 



C 3 (diamond) + H 9 + N = C 3 H 9 N gas - 9-5 



C 3 (charcoal) - 0-5 



From ammonia 



C 3 (diamond) + H 6 + NH 3 = C 3 H 9 N gas +2-7 



C 3 (charcoal) +6-3 



From methylic alcohol 



3[CH 3 (HO)] + NH 3 = (CH 2 ) 3 NH 3 -1- 3H 2 gas ... -7-3x3 



