315 
| Tp bj, ‚105 ap - a Va, OF 
| | | | | EF 
AsH3 | 382 | 1954-3X34=297 | 1455 | 121 | As=25.10-? 
} | / 
As Cl, 629 | 195 +3X115—=540 | 435,3 20,9 As —4,1.10-2 
| 
The critical temperature of AsH, was caleulated from that of 
the boiling ponit (218°,3 abs.), multiplied by 1,75 (factor 1,69 for 
NH,, 1,75 for PH). For -AsCl, 629° ‘abs. has been given as 
“calculated”; as 7’, = 403°,3, the ratio would here be 1,56 (for 
PCl, it was 1,60). In any. case we find diminished attraction for 
the said compounds. For AsCl, about 5 instead of 7, for AsH, not 
0 as for NH, and also still for PH,, but about half 5, ie. 2,5 (H 
assumed — 93,2). [If we take for H half the value 1,6, we should 
find the value 7,3.10-? for As, i.e. about the normal value 7 . 10—*}. 
d. Antimonium. The melting point is very accurately known, 
viz. 630°,0 C. according to Day and Sosman (1912). [In 1911 
629,8 or 629,2 had been given]. The boiling point lies at 1440° C. 
according to GREENWooD (1909). At this temperature the molecular 
weight of the vapour would already be < Sb, (MenscriNG and 
V. Meyer), which is confirmed by the calculation of the value of 
Wa at the critical temperature. With 7}: 7, = 1,75 [for N, this 
ratio was 1,61, for yellow Phosphorus 1,75, for the brown-black 
Arsenicum unknown; we must namely compare with the said 
modifications, where just as for Sb the boiling point lies higher 
than the triple point] we calculate for 7%, the approximated value 
2998°, i.e. in round numbers 3000° abs. 
Then the value 1057.10-+: nx follows for ap from 7, = 
78 On X ar: br with 6 = 0,909 and br = 250 .10-5, or for Way the 
value 32,51 . 10-7: Vine. 
If again we suppose, just as for As,, a direct decomposition of 
Sb, into Sb,, Sb, being skipped, then nz == 4:(1 +4 32), hence 
Va; — 16,26 .10-2* Vv A + 382). The normal theoretical value being 
— 9, this points to a great dissociation to simple molecules Sb,. If 
for the attraction of them we again assume a value in the neigh- 
bourhood of 30.10-?, a value > 1 follows for 2 from 
16,3 V1 + 3¢ = 9(1- 2) + (+ 30) a, 
so that «—1 must be assumed, unless for Yaz, a value is assumed 
> 32,5.10-2. The dissociation to Sb, is therefore complete, and we 
