606 Unit-Stere Theory of Molecular Volume. 



Formic Esters. 









M 



V M 





V. 



v. 



W 



w ~ v w' 



Methyl ... 



62-7 



1-045 



3-812 



3-688 



Ethyl 



84-6 



1143 



3-363 



3-678 



Propyl ... 



106-2 



1-197 



3-142 



3-666 



Butyl 



1276 



1-251 



3000 



3-645 



Amyl 



150-5 



1-297 



2-900 



3-671 



Hexyl 



173-3 



1-333 



2-826 



3-688 



Heptyl ... 



196-7 



1-366 



2-769 



3-711 



Octyl 



220-3 



1-394 



2-724 



3-734 



Octyric Esters. 













M 



V M 





M. 



V. 



v. 



W. 



W* 



w ~ v - w* 



Methyl ... 



158 



2201 



1-393 



58 



2-724 



3-794 



Ethyl 



172 



245-9 



1-429 



64 



2-687 



3-842 



Propyl ... 



186 



270-3 



1-453 



70 



2-657 



3-861 



Butyl 



200 



295-9 



1-479 



76 



2-631 



3-893 



Amyl 



214 



— 



— 



82 



2-609 



— 



Hexyl . . . 



228 



— 



— 



88 



2-590 



— 



Heptyl ... 



242 



377-0 



1-557 



94 



2-574 



4-010 



Octyl...... 



256 



404-3 



1-579 



100 



2-560 



4-043 



The same reasoning may be applied to the variations in 

 y 

 the valne of ^ for the ethers. They are due in all cases to 



the relative variation of the two factors, specific volume and 



molecular weight , , 



— -, P— . in some homologous series, e. a. octvric 



sum ol valencies u J 



esters, the specific volume varies more widely; in others, e.g. 



the aliphatic iodides, the second factor predominates, and 



the ratio ^ scarcely depends at all on volume changes. 



The University, 

 Edgbaston, Birmingham. 



