18 AKT. 11. — T. YAMAMOTO : THE FUSION CURVES 



It is interestiDg to note that CI has its maximum value at 

 about 330° absolute, at a lower temperature it diminishes slowly 

 in spite of the increasing x. While at 3f50° only 89^ of phenol is 

 associated to (CgH60)3, at 300° less than 7Yo remains unassociated. 

 In these regions experimental error has enormous influence on 

 the value of ^3 as calculated by the equation (12), and it is 

 hardly possible to determine more than the order of the magni- 

 tude. Hence for the evaluation of Cl and X in equation (3) 

 only a part of the data is available. These were calculated 

 by combining five of the most trustworthy values of ^3 and T 

 (No. 4 -No. 8). It was found 



D = 15762. calories 

 X = 388.74. 



The value of q, the heat of dissociation of (Cr,HG0)3 appears 

 rather large. Yet it is considerably less than the heat of dis- 

 sociation of paraldehyde, which was found to be 23300 calories.^^ 

 Ë corresponding to various temperatures was then calculated 

 by (3) employing these values of D and X. The values of ^ 

 obtained in this way are given in the last column of the fore- 

 going table. The agreement between the last two columns is on 

 the whole quite satisfactory, although the deviations at the highest 

 and the lowest temperatures may appear at first sight unduly 

 large. But as indicated above a very slight error in deter- 

 mination of temperature or composition affects the value of 5v 

 enormously, and the deviations are not so great but that they 

 can be accounted for by experimental errors. On the whole we 

 may consider the equation (3) well fitted to show how the dis- 

 sociation varies with temperature. 



1) See the foregoing article. 



