( 288 ) 



of I ho law of cori-espoiidiii,!;' slates, in Ihc form as lai<l down in 

 § 4. whit'li deviates Utile from that of Snppl. X". 8, Sept. '04. 



In llie tirst j)la('e llie ol>sei-\(Ml pressures must he rechieed lo the 

 same lem|»eralure 20^(\ For this pni-pose Ave lia\(M'aleulated Ihe real 

 ('oeflici(Mils of prcssnre-xarialion of earhon (Hoxidc (().()().')4()()) ajid 

 melh\l (•hh)i-ide (().()(Kjr)8l)) with the e([nalioii of stale mentiojied and 

 the eoeflieient of [)ressure-\ai-ialion <>iven helo\v for ideal gases, and 

 we have taken lineai-l_v inleri)olate(l values for the mixtures. 



Owinii to the small «lillerenees in tempei'ature ihe eri'ors ensuing 

 from ihis remain helow those of the observation. 



JiCt r he the volume expressed in terms of Ihe Iheorelieal normal 

 volume (introduced in ('omni. N". 47 Fehi-. "99), then we have 

 approximately 



pi' = .1 -| . w here yl := 1 -|- «« f 



1' 



and (( the eoeflieient of pressure-variation of an ideal gas. One 

 of tlie advantages of Ihe empirical ivduced equation of slate is, that 

 it leaches us the degree of a|)|»ro\imalion to \Nhich Ihe higher terms in 



may be omitted. Then we have for the calculation of the second 



xirial eoeflieient as a lirsl ap|>roximation, if />■' also is neglecled (for 

 further appi'oximaiious see § 5): 





1 



B 



.; (/'i — P-i) 



(1) 



and with «^ = 0,00360] 95 (instead of 0,0036G25 of Comm. X". 71; 

 we deri\e from table 1 : 



TABLE II. Second virial eoeflieient for mixtures of carbon dioxide 

 (,j.' = 0) and methyl chloride (.<.■ z= 1) to the tirst a])proximation. 



composi- 

 tion 



0.0945 

 50:^0 

 



/)■ 



p, from I and II j 



B I B 



- 2 from I and III j -^ mean 



0.01707 — OlSOO 



o.oi:w2 - oi:^ o 



1 



0.01034 — 0.0100.'. t 



Keesom, Comm. NO. 88. 



— 0.01798 



— O.Ol.SIO 



— O.OiOlO 



B 



-0.0'207I 

 -0 (M.'.OO 

 -0.0117.-) 

 -0.00654 



