Amount of mixture | Number mols. of N,H, on 100 mols. 
Temp. | 
and barometer. liquid, | vapour. 
102.2 | 9.4 0.18 
300 erm. 755.5 | 104.6 | 14.2 
” 105.9 | 1.6 
pn 107.45 19 5 2.7 
” 109.15 3.9 
” 111.0 6.2 
” 114.95 | 34.0 13.8 
Z 117.95 | 4A .7 25.0 
85 g1 768 .0 118.6 12.9 30.3 
” 41320 | 45.2 24.9 
” 119.8 | 50.3 | 4.7 
38 gr. 770.8 120.2 51.8 44.6 
” 120.35 53t3 | 48.75 
„ | 120.45 | 54.8 | 52 8 
” | 420.5 56.0 53.5 
[120°5 58.5 | 58.5] 
daken 120.45 62.5 | 
" 120.95 65.8 72 
” 119.9 68.3 15.5 
; | 419.5 Ho Si Pie 
“ 119.25 73.6 83.7 
50 gr. ” t | 418.8 76 
It should be observed beforehand that the figures obtained, parti- 
cularly those relating to the mixtures.rich in hydrazine, cannot pos- 
sess that accuracy attainable with other mixtures. In the first place 
free hydrazine is a costly substance; working with a large quantity 
such as is required for the accurate determination of a boilingpoint 
curve, therefore, leads to not inconsiderable expenses. Moreover, free 
hydrazine and its mixtures with little water (also the hydrate N, H,. 
H,O) are very hygroscopic and also easily oxidisable by the oxygen 
of the air. During the volumetric determination of the amount of 
