324 ai. KUH ARA 



Spécifie gvavity at -^01». 7°. 



(1) 0.8082 (4) 0.8071 



(2) 0.8082 (5) 0.8120 

 ( o ) 0.8075 ( (i ) 0.8073 



Mean 0.8083 



opecmc volume = -; ^ — = ~mjnöw = I'M).,) 



J bp. gravity O.HOöö 



S[)eciti<.' volume of eamplior and of borueol calculated with 

 Kopps values of the atomic volumes of carbon, hydrogen and 

 oxygen, supposing the former as a ketone and the latter as an 

 alcohol, i;-^ found to he as follows : 



Camphor. iJorneol. 



Ciu 10x11 =110 C,o 10X11^110 



III« l(i X 5.0 = 88 II.B 18x5.5= i)[) 



{) 1x12.2=12.2 O 1x7.8=7.8 



Specific volume 210.2 21(i.8 



Thus it is seen that the calculated values are much greater than those 

 found by experiments. Also the specific volume of benzene and of 

 some of its derivatives calculated with Kopp's values is often found 

 to be much greater than those obtained experimentally. In Watt's 

 Dictionary of Chemistry, 3rd Sujiplenient, page 212(), the following 

 statements are given, "Lothar ^Icyer makes H = 3 and Löschmidt 

 C = 14 and H = 3.5 ; and by assuming that half the carbon atoms in 

 benzene have the value 11 and the remainder the value 11, and that 

 hydrogen has the constant value 3.5, we obtain a value for this 

 hydrocarbon which is identical wiih the observed values." Thus: 



