MABERY. — COMPOSITION OF PETROLEUM. 291 



The chlorine derivative of this hydrocarbon was formed by passing in 

 chlorine over water. After washing, drying, and fractioning in vacuo, 

 the chloride collected in larger quantities at 105°-110° (50 mm.) An- 

 other portion collected at 140°-145°, probably a dichloride. The specific 

 gravity of the monochloride at 20° was 0.9470. A determination of 

 chlorine gave the following value : — 



0.1840 grm. of the oil gave 0.1476 grm. AgCl. 



Calculated for C 10 H, 9 C1. Found. 



CI 20.33 19.80 



The molecular weight of the chloride at the freezing point of benzol 

 was also determined : — 



1.2536 grm. of the oil and 21.29 grms. benzol gave a depression of 



1°.6S9. 



Calculated for C, H 19 C1. Found. 



174.5 171 



A determination of the index of refraction of this chloride gave 1.468. 

 The molecular refraction calculated as follows : — 



Calculated for C 10 H 19 C1. Found. 



50.89 51.34 



On account of the small quantity of the dichloride obtained, it was not 

 possible to purify it completely by distillation. But a determination of 

 chlorine gave 31.53 per cent; required for C 10 H 18 C1 2 , 33.90. A deter- 

 mination of molecular weight gave 199 ; required for the dichloride, 209. 

 The molecular refraction calculated from the index was 56.98 ; calculated 

 from the formula, 55.81. On account of the differences between the 

 theoretical values for the mono- and di-chlorides, these values are sufficient 

 to show that the dichloride was formed and separated in nearly a pure 

 form. 



Undekanaphtene Chloride, C n H 2 iCl. 



The index of refraction of this hydrocarbon was found to be 1.4403, 

 and the molecular refraction : — 



Calculated for C n H 22 . Found. 



50.70 50.63 



This determination was made in the distillate 190°-192°, which was 

 used for all work on this hydrocarbon. 



