1343 

 TABLE 3. 



value of Q^ is in accordance with this supposition ; the region where 

 compound coexists by the side of gas, lies namely on the side of 

 higher pressure with respect to the three-phase line. 



When we take the mean value from the three tables, it appears 



that the value tor o/^o "o amounts to J333, trom which follows the 



value 6090 for Q^. 



The external work in the transformation amounts to /i 7', because 

 one gramme-molecule of gas is formed in the conversion ; at the 

 quadruplepoint (/ = — 0.4°; see § 9) this work is 541 cal. 



The change of energy amounts, therefore, to 5550 cal. The trans- 

 formation is given by : 



' H^S.n H,0-;;t H^S -] n H^O — 5550 cal. 

 (solid) i9<^^) {solid) 



9. The Three-phase Line Hydrate- Aqueous Liquid-Gas. 



in the tables 4—6 the results are recorded, which were obtained with 

 the same samples as those in §8. In the fifth column (^7 represents the 

 number of volumes H^S of one atmosphere, (corrected for 0°), 

 which dissolves in one volume of water. ') it follows from this by 

 a simple calculation on assumption of Henry's law that in one 

 gramme-molecule of water 1.057.10"'* aP gramme-molecules of sul- 

 phuretted hydrogen dissolve; this amount is indicated by q. 



(1 + r—.s) A log F 



In the tables b gives the absolute value ot , .„ , — ' — 



A 71 



2.303 li (see equation 13), /• and s have been calculated accoi-ding 



to 10// and fj, in which the value 6 was substituted for n. 



The found values of E^ can now serve for the calculation of that 



value at the quadruple point. 



1) Landolt— BÖKNSTKIN Roth. Tables p. tiUl. Determinations by Winkler. 



87* 



