the Heat of Combustion of Organic Compounds. 201 



Oxygen Molecular 



p -j Molecular atoms n for heat of H 



ompoun . formula. complete combustion. ~~n' 



combustion. H. 



Mercaptans, Sulphides, Sulphocyanides, &c. 



Hydrogen sulphide H 2 S 3 136-7 456 



Methyl hydrosulphide CH 4 S 6 298-8 50"0 



Ethyl hydrosulphide C 2 H 6 S 9 455"6 506 



Dimethyl sulphide C 2 H 6 S 9 4573 50*8 



Diethyl sulphide C 4 H 10 S 15 7721 51*5 



Thiophene C 4 H 4 S 12 6106 50*9 



Methyl sulphocyanide C 2 H 3 SN 7*6 398'9 53*3 



Methyl isosulphocyanide C 3 H,NS 7*5 392-0 52*3 



Allyl mustard oil C 4 H 5 NS 12-5 675*3 54-0 



Carbon disulphide CS 2 6 265-1 44*2 



Carbonyl sulphide COS 3 13P0 43*7 



Cyanogen, Hydrogen Cyanide, Nitrates, and Amines. 



Cyanogen C 2 N 2 4 259'6 64"9 



Hydrogen cyanide HCN 25 158-6 63"5 



Acetonitrile C 2 H 3 N 5 '5 312-1 567 



Propionitrile C 3 H 5 N 8-5 471*4 55'4 



Ammonia H 3 N 1*5 906 60*4 



Methylamine CH 5 N 4*5 258'3 575 



Dimethylamine C 2 H 7 N 7*5 4204 561 



Trimethylamine C 3 H 9 N 10*5 582-6 55"5 



Etbylamine C* 2 H 7 N 7*5 415'6 55-4 



Diethylamine C 4 H n N 135 734'5 54*4 



Triethylamine C 6 H 15 N 195 1052*3 54-0 



Propylamine C 3 H 9 N 105 575'7 54'8 



Isobutylamine C 4 H 1L N 13 5 725'3 53'7 



Amylamine C,H 13 N 16-5 890*5 54-0 



Allylamine C 3 H 7 N 9*5 531*2 54'9 



Aniline C 6 H 7 N 15*5 838-4 54-1 



Pyridine C 5 H 5 » 12-5 6750 540 



Piperidine C.H U N 15*5 833"8 54-1 



Nitro-compounds, Nitrites, and Nitrates. 



1. 2. 1. 2. 



Nitron- ethane CH 3 N0 2 3"5 1-5 180-9 51-7120-5 



Nitroetbane C 2 H 5 N0 2 65 4-5 337'9 52-0 75*1 



Ethyl nitrite C 2 H 5 N0 2 6'5 4-5 334*2 51'4 74*3 



Isobutyl nitrite C 4 H 9 N0 2 12'5 10*5 647"6 51*8 61*7 



Amyl nitrite C 5 H 1v n6 2 15*5 13*5 812*6 52-4 602 



Ethyl nitrate „. C 2 H 5 N0 3 6-5 35 3240 49-9 92'4 



5. From the relation H = 53n the quantity of air required 

 for the complete combustion of any hydrocarbon of unknown 

 composition, such as a petrol substitute, can be found when 



