( B8 ) 



slight amount, in tlie solid phase to a verj great amount, as we 

 saw before; only in the neighbourhood of critical points the concen- 

 trations approach each other. 



As the functions of the temperature C-^ in the two members cancel 

 each other the condition of equilibrium, viz. : (see also IV p. 133 — 

 J 35; These Proc. June 1909): 



i.e. the equality of the molecular potentials of the compound mole- 

 cules [then naturally C'^2)/= Cm^X^l in the two cases because of 

 fij =:= n{i^'\, passes into : 



ETloffC^ I =: {l(l)solid 



\^n. 



{h) 



liq. 



From the expression for ii', derived in § 30, viz. 



V — h a 

 o' = :En, . RT log — — H pv, 



follows : 



Ö52' v—h ^,„ 2:n,.RT 2a^ 



—- = RT log ~ RT- — '--— h, + ^, 



OWj ^n^ V — b V 



0^ . . ■ . 



because the terms with - — vanish in consequence ot the equation ot 



db da 



state, while -— = b. and ^^ ^ 2(i^. For from a=n^\i^^2n^n^a^,^-\-n^ a, 



follows 



da f nii \ 



— = 2n,a, + 2n,a,, = 2 (l-,i) + — a, = 2a„ 



dn^ V " / 



a, 

 as a,^ = —. So we get: 



öii' RT , ^ 2a 



-— = RTlog —~- - RT - b, (p -f "/..) + -, 

 On, p-^"/v"- ^ 



writing again :i for a^ (see § 30). In consequence of this the relation (/^) 

 passes after division by RT into; 



^''%,^ai^,,^m\v-^ v'^J RT^V V 



-log 



l-^ l+(n-l)/5'- 



0, 



when the solid phase is indicated by accentuated quantities. So we 

 get finally : 



[>+V,. 1— .J 14-(n-l);J' 



\p^-"/MMn-l^ 1-/3' 



quite in accordance with (19) in V, p. 455. Only, 1 -f (vi— l)p? is 



a 

 RT 



V V J v ? 



1 1 



, . (29) 



