( 800 ) 
under the © sign in equation (6), whereas / is only dependent on 
the temperature and on the quantities characteristic of the different 
substances according to our suppositions. Hence 
dlk LO 
dp RT dp 
or as according to equation (5) 
Ou’, Ou 
dp Op 
lk 1 = 
— Oe se ae 
op RIP op 
Now for a mixture of 2 components, of which resp. 2,.7,...%n 
gram-molecules are present 
de = Td — pdv + u‚dn, + u‚dn,...- Undr, 
where w is the molecular thermodynamic potential. 
Or: 
dg == — ydT + vdp + u, dn, + uy dn, «Un dan 
($2) ( Ov ) 
Op In Ne n, On, DA ys ae) n, 
in consequence of which (11) passes into: 
pret =(5) (=~) Ho) +ete. (12) 
Wil =S —— mere = etc. a 
dp On) pe Tomo pd ye My On, png n,, On, pe Lyng, 
So in order to examine the change of the velocity of reaction 
with the pressure, we have to determine for every substance of the 
disappearing system (resp. the forming system) the change of volume, 
which takes place when we add one gram molecule to the whole 
system (reacting substances, reaction products, solvent), the quantity 
of this last being thought so great that it does not change the con- 
; dlk 
centrations. The sum of these variations gives Be 
yp 
It is clear that it will be a great exception if one of the quantities 
and so: 
v 
(=) becomes negative. For this would mean that there was a 
it 7 
contraction so considerable that the mixture occupies a smaller volume 
after the mixing than the solvent alone. Yet it must not be consi- 
aie v 
dered as impossible a priori, and a negative value of (=) seems 
n 
