CHEMICAL THEORY OF SOLUTIONS. PART I. 



51 



From these two sets of values we obtain for tlie constants 

 of equation (27) 



S: = 329.4 



D = 23340 calories. 



The heat of polymerisation D can also be calculated from the 

 thermochemical data. Berthelot and Delepine found the heat 

 of combustion of acetaldehyde C2H4O to be 279150 calories, 

 while the heat of combustion of paraldehyde CgHjoOs amounts 

 to 813200 calories according to Louguinine. Hence 

 O = (3x279150-813200) cal. = 24250 cal. 



The agreement must be looked upon as quite satisfactory, when we 

 take the errors of thermochemical measurements into consideration. 



r)( ° ■— 



50^ 



40'^ 



80"^ 



20° 



10° 



0.2 



Acetaldehyde. 



0.4 O.G 



Fm. 11. 



O.S .1 



P.araldehvde. 



