( 289 ) 



§ 3. Tlir rir/'il (■(>(>/fi('/('i)f ]] <is <i quatlndic fiinclioii of the molecular 

 coiii/wsition .1'. 



Afford iiVU' lo vw dkk Wa.\i,s" ('(|iiati(tii ol'slah^ /> = irFhimi ((inir, 



if <iri„r and hiini i't'|»res(Mil \ AN dkk Waai.s' coiislaiits willi re^'ard 

 to the (hoorclical iioi'inal noIiiiiic. IIcikh', lo IIk' ür^l appi'oxiinalion, 

 we innsl lia\'e loi- llie iiii.xliii'e \\illi llie coiiiposilioii ,/; 



(Cl Mc. CO.,) iClMe) (J 'I Me. ( 'O.,) {< 'O-i) 



ji ^ 7,^ ,,. + 2 (,,)/; .V. (1 - ,v) + B {\-xy 



By lucaiis of least s(|uares we foiiiKT): 



{(•IMé) 



B.,Q„ ^ __ 0.020772 



((7 Me. CO.,) 



(i.^yjoQo = - ().010()137 



7J200 = — 0.006515. 

 The agreement appears from (he following table: 



,1" B observed B computed Obs. — Comp. 



1 _ 0.02071 — 0.02077 + 0.00006 



0.6945 — 0.01509 - 0.01490 — 0.00019 

 0.5030 — 0.01175 — 0.0J190 -f 0.00016 

 — 0.00654 — 0.00652 — 0.00002 



The deviations are less than 2"/„, hence also less than llie devia- 

 tions of the single values of - inter se. Thus the agreement with 



the (puxdratic form was sutKiciently proved, so that for the time 

 being measurements with other mixtures, not exceeding this accuracy, 

 could be left off. 



§ 4. VaUdltii of the laiv of co ires pond iw/ states for the r'teial 

 coefficient B. According to the law^ of corresponding states the virial 

 coefficients are derived from the coeflicients (►f the rediu-ed eipiation 

 of state through mnltiplication by functions of 7'/, and />/, (com[». 

 Comm. N". 71 aiul also Sn[)i)l. N". 8, Sept. '04, the first four 



sections). 



As the critical data of mixtures of carbon dioxide and methyl 

 chloride have been derived in C!omm. N".59/> from Kiknkn's e.\i)eriments, 

 we mav determine B for a given temperature, foi- instance /i^o by 



/>'2„=:: ^Or, 



pic 



1) TliG coefficients given hci'e liavc been derived from values for B wliicli do 

 nol difTer essentially from those given in table II. 



