( 790 ) 
chemistry, and in this department there is a rich experimental 
material at our disposal. When we now consider that with these 
chemical velocities also a great number of particles leaves the reacting 
mixture with formation of new substances, the question naturally 
suggests itself whether the expression found will not be able to 
throw some new light on this region. 
So we shall have to investigate whether the velocity of reaction 
can be expressed in the following form: 
ie t+ 1 PT gt 2 
le nN ay 
gaol ae ee 
dt 
and, are the sum of the molecular thermodynamic 
in which u, 
potentials resp. for the disappearing and forming systems, and /’, and 
i’, functions of the temperature, and further of constants which 
refer to the reacting substances or perhaps to the intermediate states 
occurring in the reaction !). The two functions /’, and /’, have the 
dimension of an energy, and the value of the constant C accounts 
for the choice of our unity of concentration and time. For its 
dimension is c/f, and accordingly may be taken equal for the two 
partial reactions. 
§ 2. Now in the first phase we shall show that both for rarefied 
eases and for dilute solutions equation (2) leads to the well-known 
expression for the law of mass-action. If in (2) we substitute the 
value of u for a mixture of rarefied gases: 
» Cy 
dje ST ryy NN ; | ST rr Ld A} el Did Al 
— Xp = PES aay) EN ede EDEN ceed 
Lo a 
KL =P, In C, Segall =P, 
and 
> wy 
1 
oie ead SS ry? > sa) 3 SS) : ry? ryy ue ry? 
—_— oo x sy at D 1 me eh : Ag! Foe = aa Db WES Dil = 
Ur kenen =| Chant Ce “al 7 al 
4+ RT Sv i Cry ARTS 
[ TUL 
we get: 
1) According to equation (2) not the thermodynamic potential itself, but an 
exponential function of it would be the function characteristic of the reaction. Cf. 
also Ghem. Weekblad 7, p. 920 (1910). 
