Method of Determining Vapoiir-Densities. 4G7 



Calculated. Found. 



Vapour-density 3*224 3-3()0 



Tliird E.vperiinent. — Benzoic Acid. Melting-point 120° C. 

 Purified by repeated sublimation. 



Amount of substance employed 0*83 grm. 



P =39-1488 grms., B =745 millims., ^ == 17° C. 

 Pi = 38-9430 grms., Bj = 745-5 millims., ^i = 229° C. 



M = 605 millims., V = 330-8 cub, cent. 



Calculated. Found. 



Vapour-density 4-2042 4-398 



Fourth Experimsnt. — DIm3tli7lhv^droquinon. Boiling-point 

 204° to 205° C. 



Amount of substance employed 0-73 grm. 



P =44-3440 grms., B =745 millims., t = 17°-5 C. 

 Pi = 44-1935 grms., Bi = 744 millims., ^i = 201° C. 



M = 575 millims., V = 352 cub. cent. 

 Residual air = 1*5 „ ,, 



Calculated. Found. 



Vapour-density 4-772 4-741 



Fifth Experi7yient. — Dimethvlresorcin. Boiling-point 214*^ 

 to 215° C. 



Amount of substance employed 0-5 grm. 



P =34-3014 grms., B =744 millims., t= 17° C. 

 Pi = 34-131 grms., Bi = 744 millims., ^i = 211° C. 



M=605 millims., V = 266 cub. cent.. 

 Residual air = 3-6 „ 



Calculated. Found. 



Vapour-density 4*772 4-69 



Sixth Experiment. — Dimethylresorcin . 



P =37-102 grms., B =744 millims., t = 17°-6 C. 

 Pi = 36-8744 grms., Bi = 744 millims., ^i = 211°*5 0. 



M = 670 millims., V= 265*6 cub. cent. 



Found. 

 Vapour-densit}' 4*705 



