+ mj. 



16 W. G. Mixter — Thermal Constants of Acetylene. 



Total energy given out is 



Q' + mcj + y^tLt -JJ + m w t. 

 Hence 



Q + Mg, - -| ^-°=Q' + mc^ + V^L,- j) 



For reducing from 0° to 18° at constant pressure we have 



Q" = Q + M.C p t—mc p t—mwt. 

 Q"=Q-178. 



The specific heats of the gases used in the calculations were 

 the following : Acetylene, 0*3 p. c, 0*2 v. c. ; carbon dioxide, 

 0*2 p. c, 0*15 v. c. ; oxygen, 0*21 p. c, 0*15 v. c. The specific 

 heat of acetylene has not been determined, and it is assumed to 

 be the same as that of benzol vapor. 



Experiment !>.— Gas, 569'3 CC at 20*6° and 756'2 mm pressure ; 

 gas, 98'95 per cent acetylene ; weight of acetylene, 0*6091 

 gram; water and water equivalent of calorimeter, 3249'3 

 grams ; oxygen, 3'3 grams. 



Minutes. Temperature. Temperature interval. 



18-304 



1 18-308 20-552 — 18-312 = 2-24° 



2 18-312 



3 20-5 Observed heat, 3249-3 X2'24 = 7278-5 C 



4 20-54 



5 20-547 



6 20-550 



7 20-552 



8 20-552 



9 20-551 



10 20*553 



11 20-553 



7278-5X26-016 

 ^ 0-6091 



MC v t = -315 



3 i^ = 810 



7 J 



mc v t — 271 



V,(<r,L,-y) = 253 



mj — 370 



Q = 312269° 



