﻿Molecular Thermodynamic 



237 



function of M and n^n^ , homogeneous and of the first 



degree. And the same will hold for the " linear " terms, (if 

 (M G) be accepted as the new " general terms"), a point of 

 obvious importance since the "linear"" terms must alone 



remain when the solution is " perfect." ^ retains the 



on s 



simple form (17), which may now be written 



(20) 



since 



d(M G)\ BG 





(21) 



G being a function of c x c 2 only (besides T and p), 



Also, of course, 



122) 



\ B» S /noi ' 



and 



M G=M,G M + S«,G S 



(23) 



We observe, however, that this convenient arrangement 

 involves theoretically a certain definite (though probably 

 always very small) change in the division into " linear " and 

 " general " terms, since 



M G' = 2h 01 G i' + n sG s / ; 



G'=Zc 0l G 0l ' + Xc s G s 



= G+f 2G 01 '^ 01 (21) 



~c=o 

 Xow it is readily shown that 



Grni' = 



d^oi 



i [n< v„ ^G v ^G n 

 + m i G — ZCoi^-, 2.<?* ^— 



(25) 



and since, 2m 01 c 01 being unity, 2??z 01 <ic 01 is always zero, we 

 have 



G 



'— g= (v ?^*- 



J 3<?oi 



c=o 



(20) 



To say that any such modification of the division into " linear " 

 and "general" terms is due to, and represents, a departure 

 on the part of the solvent molecules from " perfect " 

 behaviour would be to make a qualitative statement of no 



