Molecule of a Substance and its Chemical Properties. 919 

 Table X. 



Substance, 



Tc. 



2 V^r 



T c 



2 >J m[ 



Ethyl methyl sulphide 

 Ethyl sulphide, 

 Methyl sulphide, 

 Ethyl sulp hydra fe. 

 [soarayl sulphydrate, 

 Isoamyl sulphide, 

 Allyl sulphide, 

 Ethyl disulphide, 



, C 3 iT 8 S 



532-7 



557-7 



592 



501 



603-9 



664-2 



653-4 



441-9 



2404 

 29-50 

 18-58 

 18-58 

 31-96 

 62-26 

 3642 

 35-16 



22-16 

 18-91 

 31-85 

 26-96 

 1727 

 1067 

 1795 

 12-57 



0,H, n S 



C 2 H 6 S 



C H\,S 



5 H 10 S 





C.H,„S 



O.H.nS, 





Hydrocarbons. 

 Table XL contains the values of 



^=- o£ a number of 



X sf mi 



paraffins and benzenes. The chemical formula may be 

 written 2H + a(C + H). Let us suppose that 



(A 10 -2H)-<C + 2H)=-^=, 



and that the values of the quantities in this equation are 



the same for each paraffin. Subtracting each value of 



T c 

 — — c -=. from the one preceding it we obtain the values 3*50, 



2 00, 2-04, 1-43, 1*22, 92 for (C-f 2H). They are not equal 



Table XI. 



Substance. 



T c . 



2^m v 



5V% 



Substance. 



Tc. 



2 Vmj. 



T c 



Methane, CH 4 ... 



191-2 



7-46 



25-63 



Heptane. ..C-H 16 



539-9 



40-32 



13-39 



Ethane, C 2 H 6 ... 



308 



13-92 



22-13 



Octane ...C 8 H 18 



569-4 



45-68 



12-47 



Propane, C 3 H 8 ... 



370 



18-38 



2013 



Benzene ...C 6 H G 

 Ethyl 



553-6 



26-76 



2068 



Pentane, G$K V> 



470-2 



29-23 



16-04 



benzene, C8H 10 



6194 



37-68 



16-82 











Propyl 









Hexane, C 6 H U 



507-8 



34-76 



14-61 



benzene, C H 12 



599 6 



43-14 



13-90 



to one another, but decrease in value with the complexity of 

 the molecules considered, showing that the quantities A 10 . 0, 

 •H, have not the same value for each paraffin. This applies 



