Molecule of a Substance and its Chemical Properties. 915 



The value of the expression (C + 2H) obtained by substi- 

 tuting for H and C their values is 3*64, which is approximately 

 equal to 3' 52 the value o£ (C + 2H) just obtained in a different 

 way. 



Amines. 



The chemical formula for the three primary amines in 

 Table VII. may be written N + 3H + «(C + 2H.) where a is an 



integer. We would therefore expect the value of: 



to be given by the equation 



A 6 -(N + 3H + «(C + 2H)) = (A S -N-3H)-«(C + 2H) = =— p-> 



2Li \ nil 

 where A6 is some constant. It was found in the same way 

 as before that (A 6 -N-3H) =41*27 and (C + 2H) = 7'0l. 

 By means of these values the left hand-side of the above 

 equation was evaluated for each of the three primary amines 

 in the table,, giving a good agreement with the corresponding 



values of - — ^=. 



Table VII. 



Substance. 



T c . 



s V OTl . 



T c 



2^ 



(A 6 -N-3H)-a(C + 2H). 



Ethylaruine, 



Methylamine, 



Propylamine, 



C 2 H T N 



CH 5 N 



CHN 



450 



428 

 491 



17-67 

 12-21 

 23-13 



25-48 

 3505 

 21-21 



27-25 

 34-26 

 20-24 



Diethylamine, 



Dimethylamine, 



Dipropylamine, 



C 4 H n N 



C 2 H 7 N 



C 6 Hi 5 N...... 



489 

 436 

 550 



28-59 

 17-67 

 39-51 



1710 



24-68 

 13-92 



18-57 

 2381 

 1333 



Triethylamine, 

 Trimethylamine 



C 6 H 15 N 



, C 3 H 9 N 



532 

 4335 



39-51 

 2313 



13-47 

 23 06 



13-47 

 23-06 



Pyridin, 



C 5 H 5 N 



617-2 



2605 



23-69 



25-09 





The chemical equation for the three secondary amines in 



T c 



the table is the same as the above, and the value of — — -= 



we would therefore expect to be given by an equation of the 

 above form. The values of (A 6 -N-3H) and (C + 2H) for 



