( 770 ) 
3 a dode” ze 
log En == loge + y log T — ae + log T — log (» + =) RT Ab. 
fart 
or finally: 
_ % pt “fo Ab 
3 opt, BT, RT : 
1— nS Pp “Le afs Fee NG ( ) 
being the most general equation for the binary dissociation in arbitrary 
state of aggregation. The term with A5 disappears in the gaseous 
BEE so that then A: verges to 0 
BELT DAN zis vrt ss 
But for liquids (and solid bodies), it is by no means allowed to 
neglect this term (as was nearly always done up to now). For it 
would be very accidental indeed, if Ab = —b, + 26,=0. It is 
just this term with A5, which exerts a very great influence on the 
value of 8, and is one of the main causes for the occurrence of the 
state, for then 
solid state. 
a 
For perfect gases p + — may also be replaced by p, and (2) passes 
p? 
into Gipss’s well-known formula for the binary gas dissociation, e.g. 
of N,O, into 2NO,: 
1—;? Pp 
For the further discussion of the equation (2) we refer to the 
original Paper in the Arch. Teyler; we may only be permitted to 
make the following general remarks. 
If we vary the pressure at constant temperature, the second member 
of (2) will approach to oo for p=0O(v=o) in consequence of the 
denominator p, hence @ to 1. So in the perfect gas state everything 
is in the state of simple molecules. 
But for high pressures the behaviour will be of two kinds, depending 
on whether Ad is positive or negative. For Ad positive, i.e. when the 
volume of two simple molecules is greater than of one double molecule, 
the second member of (2) will evidently approach to 0, when p approaches 
Cie 
to oo. For then this member. becomes: = —- — 0. The value of @ 
le ©) 
then approaches also to 0, Le. there is complete association for 
p=. If, however, Ab is negative, so that the volume of the double 
er» 
molecules is larger, the limiting value becomes — —== %, and then 8 . 
GO 
