1021 
In the first two determinations the v-term has no perceptible in- 
fluence; in the last it has. The value of the term for chlorine will 
certainly predominate here. If this is taken into account (A= 9.5 w), 
MM, 
Mu? 
calculated from the mean molecule radii, as they are given by 
Sackur, we find 0.82, which is therefore in satisfactory agreement 
with the mean value 0,71. We must therefore ¢onclude, that if the 
centres in Cl, and H, are closer together than corresponds with the 
mean molecule radius, the same thing is the case in about the same 
degree with HCl. 
1S 
we tind the value of column 5. When the value of log 
15. The equilibrium 2 HBr 2 H, + Br,. 
When for =n we substitute in 15 the value 24200 cal, which 
was calculated by Osrwarp from THOMSEN’s measurements’), this 
equation may be transformed into: 
yh 3 
MV, en iT) 5294 
= log K + 
IM? HART, ak : T 
Deg eI =. eP 
Application to the determinations of BoDENsTRIN and GeicER*) and 
VocEL von FaLcKenstHIN *) here yields: 
DAB EE VIJE 
Ait 968. 449) 
t | T | logK Second eae 
| | ber of 19 Observer 
30 303 | —18.43 | £01 BODENSTEIN and GEIGER 
1024 | 1207 — 5.20 0.85 | VOGEL VON FALCKENSTEIN 
1108 1381 | — 4.87 | 0.93 a 
1222 1495 | — 4.53 | 0.98 5 
| 
| | 
At T=303 the influence of the r-term is still imperceptible ; 
M,M ; é SRA. 
log 5 =, therefore, amounts to 1,01 according to this determination. 
iM, 
MM, 
From the mean molecule radii we find log = 1,11 in good 
1 
harmony with it. 
1) OsrwaLD. Allgem. Chem. II. 1, 110. 
2) BoDENSTEIN and GEIGER. Zeitschr. f. physik. Chem. 49, 70 (1904). 
$) VOGEL VON FALCKENSTEIN. Zeitschr. f. physik. Chem. 68, 279 (1909) and 72, 
i15 (1910). 
