Volumes, and Chemical Characters of Liquids. 417 



cular weight, M, (3) the liquid density at boiling-point, D T (if 

 observed), with the observer's name, (4) the value of V T found 



( = yr )) or (5) * ms value calculated from atomic-volume 



numbers, (6) the absolute boiling temperature, T, and (7) the 



value of the ratio -7^ . 



Table II. 











V T . 



1 





Formula. 



M. 









T. 



Vt 





Found. 



Calculated. 



T ' 



(C 2 H 5 ) 2 ... 

 (C 2 H 5 ) 2 S ... 



73-84 

 89-86 



•69566 

 (Masson) 



106-14 



121-6 



307-9 

 365 



•3447 

 •3332 



(C 3 H 7 ) 2 ... 



(C 3 H 7 ) 2 S ... 



101-78 

 117-80 



•6743 



(Zander) 



15094 



165-6 



363-7 

 405-5 



•4150 

 •4084 



(C 4 H 9 ) 2 ... 

 (C 4 H 9 ) 2 S ... 



129-72 

 145-74 



•6575 

 (Dobriner) 



197-29 



209-6 



413-9 

 455 



•4767 

 •4607 



(0 2 H 5 ) 3 N ... 



(C 2 H 5 ) 3 P ... 

 (C 2 H 5 ) 3 As... 

 (C 2 H 5 ) 3 Sb... 



100-83 



117-78 

 161-72 

 206-82 



•6621 

 (Schiff) 



152-29 



173-8 

 174-8 

 177-1 



362 



400 

 413 

 431 



•4207 



•4345 

 •4233 

 •4109 



(C 2 H 5 ) 4 Si ... 

 (C 2 H 5 ) 4 Sn... 



144-06 

 233-56 







228-3 



238-8 



426 

 454 



•5359 

 •5260 



(C 3 H 7 ) 4 Si ... 

 (C 3 H 7 ) 4 Sn... 



199-94 

 289-44 







316-3 



326-8 



486 

 498 



•6508 

 •6562 



The atomic volumes of selenium and tellurium are not even 

 approximately known. Ethyl selenide boils at 108° C, and 

 the telluride at 98° C. If these compounds follow the rule, 

 therefore, tellurium must have a smaller atomic volume than 



selenium. If a value for -~ be assumed slightly smaller than 



that obtained by direct experiment with the oxide, viz. *34 

 instead of '3447, we get V T =129'5 for (C 2 H 5 ) 2 Se and 

 V T = 126-1 for (C 2 H 5 ) 2 Te; whence, if C 2 H 6 = 49'5, Se = 30*5, 

 and Te = 27*l, as approximate values. 



