410 



w = 7, X 1,177 X 516,2 (0,01638 + 



+ V, 1,044 . 0,1280 |0, 1983 — V, 1,177 . 0,1280 . 1,6427|) 



= 2126(0,01638 f- 0,02227 { 0,1983— 0,0619|) 



=2126(0 01638 4- 0.00304) = 2126 X 0,01942 = 41,3 gr. cal. 



Bilt + 120 is found (Young). [Winkklmann (1872) gives — IIOJ. 

 Tlie lenii with A?; is here 197o of the principal term. We calculate 

 for ^7,: 



^7,, = 7^^ X 1,117 X 0,1280 X 0,1364 =-0,00086. 



Young found 0, and Guthrie -|- (1884). 



In the expression Ay = (Av)„o,,„-|- 7J(ij— /?/) A, (cf. (8) in § 6) 

 A,, i. e. the volume contraction on transition of 1 double molecule 

 CjHgOH to two single molecules, seems therefore to have a small 

 negative value. But in iv = iVnon» -\- Q = ?'^« + 7» (i^» — i^/) Qi = 



=^^^+V,(P^,-/^.°)fg. + , /; , AA(cf. e.g. iL. in ^6) (2, should 



also be negative then (leaving </, out of account). In reality 7j(^!i — i^i'')Qi 

 seems, however, to be about 80 gr. cal., which would point to a 

 comparatively large positive value of Q^ (hence also to a positive 

 value of AJ, but seeing the deviating value of Winkelmann, little 

 can be said with certainty about this. Indeed, we know little or 

 nothing about the value of /■? — /?„• 



5. C\H,OH—CH,OH. Here we have: 



This gives: 

 10 = 7, X 1,113 X 513,1 (0,01084 + 



+ 7, 1,003.0,1041 {0,1095^—7, 1,113.0,1041 . 1,7929 |) 

 = 1999 (0,01084 + 0,01740 | 0,1095^—0,0519^ j) 

 = 1999(0,01084 + 0,00100) = 1999 X 0,01184 = 23,7 gr. cal. 

 The term with l\v would, therefore, in any case be about 97. of 

 the principal term. Further: 



^7^ = 7,^ 1,113 . 0,1041 . 0.0576' = 0,00028. 



Accordingly more or less these values would have to be found, when 

 the alcohols were not associated. In reality, however -^7^ = 0,00004 

 is found, which points to a certain volume contraction in both 



