352 Mixter — Determination of the Heat of Dissociation 



is 0*6342 gram. Rather more dry oxygen was added than 

 required for complete combustion. 



Water and water equivalent of 

 calorimeter, 3252 grams. 



Temperature interval, 



3-264 — 0-95 + 0-OOT = 2-321° 



The resulting value is 309,400°. 



Experiment 8. — The bomb filled as before contained 0*6527 

 gram of acetylene. Jacket 1'6°. 



Minutes. 



Temperature 







0-935 



3 



0-943 



6 



0-950 



9 



3-270 



12 



3-264 



15 



3-260 



18 



3254 



21 



3-250 



inutes. 



Temperature 







340 



3 







350 



6 







360 



9 



2 



750 



12 



2 



762 



15. 



2 



760 



18 



2 



756 



21 



2 



750 



24 



2 



743 



Water and water equivalent of 

 calorimeter, 3252 grams. 



Temperature interval, 



2-762 — 0-36 + 0-007 = 2-409° 



The resulting value is 312,100 c . 



Experiment 9. — The bomb was filled as for experiments 7 

 and 8 with dry oxygen and acetylene and contained 0-6456 

 gram of the latter gas. Jacket, 2*6 r 



'O 



Minutes. Temperature. 



1*109 Water and water equivalent of 



3 1-111 calorimeter, 3252 grams. 



6 1-113 



9 3-502 Temperature interval, 



12 3-500 3*5 — 1-113 4-0-012 = 2*399° 



15 3-490 



18 3-482 



21 3-476 



24 3-470 



The resulting value is 313,700 c . 



The mean of the three determinations of the heat of com- 

 bustion of acetylene is 311,700° and of the last two it is 312,900 c 

 at constant volume and 313,800 c at constant pressure. 



Before discussing the foregoing results reference must be 

 made to the heats of combustion of hydrogen and amorphous 



