MABERY. — CONSTITUENTS OF PETROLEUM. 137 



oil gave the faint characteristic odor of these hydrocarbons, which is 

 easily recognized when the impurities are removed. It then gave per- 

 centages of carbon and hydrogen required for a hydrocarbon of the series 



I. 0.1502 gram of the oil gave 0.4665 gram CO2, and 0.2090 gram 



HoO. 

 II. 0.1661 gram of the oil gave 0.5157 gram COo, and 0.2322 gram 

 H,0. 



Found. 



I. n. 



84.70 84.67 



15.46 15.53 



The specific gravity of the oil 196°-197°, after purification in this 

 manner, was found to be 0.7581. The close agreement in specific gravity 

 of the products after treatment with the mixture of nitric and sulphuric 

 acids, and with fuming sulphuric acid, as well as the proportions of carbon 

 and hydrogen, indicate that the oil was quite thoroughly purified. 



That the formula of the purified hydrocarbon boiling at 196° is CnH24, 

 and not the next higher horaologue, receives further support by a deter- 

 mination of its molecular weight, in which Mr. Hudson obtained, by the 

 Beckmann method, the value 157, required for CnHo^, 156. 



In the preparation of the chlorine derivatives of the hydrocarbon CnH.24, 

 boiling point 196°, Pennsylvania petroleum, 40 grams of the oil was 

 allowed to absorb 14 grams of chlorine, and the chlorine product was 

 fractioned in vacuo. After five distillations, lOc.c. collected at 145°- 

 150° (80 mm.), that distilled with decomposition at 225°-230°, bar. 

 747 mm. This product gave on analysis percentages of carbon, hy- 

 drogen, and chlorine required for C11H.23CI : — 



I. 0.2291 gram of the substance gave 0.1713 gram AgCl. 

 II. 0.1933 gram of the substance gave 0.4914 gram CO2, and 0.2071 



Found. 

 I. II. 



09.30 

 11.91 



18.49 



The specific gravity of monochlorhendecane at 20° was found to be 

 0.8721, Pelouze and Cahours found that the hydrocarbon which they 



