300 
then with 77,=—= 2: (Ll + 7), in which ng now represents the so-called 
degree of association of the atoms Br and I, and w tbe degree of 
dissociation of the molecules Br,, resp. I,, we get: 
BET ib 2 { REE. by 
— Eis - instead of a',,—= ———: 2, 
[4,4 Ate 
so that evidently we have still to multiply the values found above 
of Vaz, by. V1 Ha. 
If now the attractions Waz, for the atoms differ for the cases that 
they are either united in a molecule to e.g. I,, or occur freely as l,, 
evidently : 
Var = (1 —w) (ar). + 0 (ar, Di 
so that at last we have for the calculation of the degree of disso- 
ciation wv : 
Var. Vite (Le) War), + &#V (ak, )ys 
in which Wa’, denotes the value calculated above with nj; = 2. If 
now for (aj), we assume the preliminary value 30 . 10~? (see above), 
we have for Br,: 
7.8 Vlt« = 6,9 (l—2) + 302, 
as before V (az, ),—= 6,9. 10 was found for the compounds (see 1): 
For « we then tind about '/,, — 0,048, so that V(1-+-7) would 
become = 1,024. 
For the real value of War we thus find 7,77 .10-?x 1,024 = 
= 7,96 .10-?, for which we may therefore write 8,0.10—2. 
In the same way we shall find for I,, with W(az), =8,8.10 2: 
10,5 V1+a= 8,8 (l—z) + 302, 
from which #=0,104, WA + 2) = 1,051 follows, so that the real 
value of Vaz, for..1, becomes = 10,55 . 10-2? X 1,051 = 11,06. 
Ts P= dit Oe 
The values found are joined with some supplementary values in 
the following table. 
TABLE B 
is var ej Aer T To | mer et | 
SEA | igen? k | || 102b’a 102Va 
T De LN D Us Np meee wd val Boy 1» | Diss. 
mR Hilal hres . Nes ee OT hin calculated in comp. | degr. © 
| Ss 
er | | | 
F, 50 | 86 | (151) || — — |} (1, 75) | (3,02) (3,81) | (2,34) 202 
| Hf | | 
Cly | 171,6| 238,6 | 417,1 | 76,1 0,573 || 1,75 2,44 | 3.36 || 5,15 54 
Br. | 265,8| 331,8| 575,3|| — GMs) | Wv: 2,16 3,20 || 8,0 6,9 
I, | 386,8 | 456,1 | 785,1 || — (1,207 a2 Da 3,14 || 11,0 8,8 
| | | | | | | | 
