( 358 ) 
increases with the temperature, and as we can say a priori, that 
the internal energy of the molecules will no doubt be the principal 
factor for a chemical reaction, this leads us already to expect, that 
when electrical energy and light-energy are absorbed, equilibria will 
be established at the ordinary temperature, which are also obtained 
with supply of heat-energy, but then at much higher temperature. 
Now the examples to demonstrate this analogy, are pretty numerous. 
REACTIONS. 
Supply heat-energy 
„ electrical „ 
„ light „ 
30 2 ^20 3 
N 2 + 0 2 ^±2N0 
2H Cl =tH 2 +a, 
„ Smits Aten 1 ) J 
„ Coehn *) 
Supply heat-energy 
8H 3 S^8H 2 +S s 
Sex+xH^xHjjSe 
2HJ^±H 2 -f-J f jj 
13 
= 
1 
» (SmitsAten) 
„ (Smits Aten) 
„ (Smits Aten) 1 
» light „ 
Supply heat-energy 
[P< + 6H 2 ^4PH 3 
j As 4 4 6H 2 ^t4ASH 3 
Sbx -f-1 xHof^xSbHs 
„ electrical „ 
„ (SmitsAten) 
» (Smits Aten) 
„ (Smits Aten) 
» light „ 1 
Supply heat-energy 
„ electrical „ 
» light 
2C0 2 ^±2C0+0 2 
„ (SmitsAten) 
„ (Chapman) 3 ) 
Thus I might continue to show that really the photo- and electro¬ 
chemical equilibrium at the ordinary temperature corresponds with 
the thermic equilibrium of much higher temperature, and in connection 
with this it is easy to explain that photo- and electrothermic equilibria 
set in with great rapidity. 
This is of importance particularly because we may consider this 
as a corroboration of our supposition that the most important factor 
for a chemical reaction is the internal energy of the molecules, which 
*) We will discuss the investigations, some results of which are communicated 
here, in a following paper. 
*) 1. c. 
3 ) 'Chem. Soc. p. 942 (1907). 
