( 378 ) 



(Cl Me.) 



B ° — 



(O Me, CO^) 

 {CO.) 



B„.o = 



0.01983 

 0.01005 

 0.00644 



The comparison of the values found with those of the quadratic for- 

 mula and the law of corresponding states (using Brlnkman's ^] 

 critical data) gives: 



TABLE IV. Deviations of the second virial coefficients of 

 mixtures of carbon dioxide (.i' =: 0) and methyl chloride {.v = 1) 

 from the quadratic formula and from the correspondence. 



I^from law of corre-!5 quadrat, form.] B observ. | B observ. 

 spending states. | — Ji corresp. ! — B quadrat. I — B corresp. 



1 

 0.6945 

 0.5030 







02156 

 0.01 470 

 an 35 



0.01650 



+ 0.00173 

 -1- 0.00027 

 — 0.00029 

 + 0.00006 



+ 0.00005 



— 0.00021 

 + 0.00016 



— 0.00002 



+ 0.00178 



— 0.00006 



— 0.00013 

 + 00004 



111 tiie conclusions of § 3 and ^ 4 no further modification is brought 

 about bv these further approximations. It is noteworthy that the 

 deviation now onl\' applies to the methyl chloride. 



§ 6. Comparison of the results with those o/' Leduc «vic/ Chapplis. 

 The compressibility of methyl chloride with small densities has 

 been examined by Ledlc -) in collaboi-ation with SAfERDOTE. He does 

 not give the observed results but the quantity calculated from it 

 at 16^, viz.: 



1 Ö(pi') 



.T ^- = — rr — at rr =^ 73 cm. 



pv Op 



Accordiug to Kamerlingh Onnes' empirical equation of state: 



1 h{pi 



PV dp y^ 



(Cl Me.) 



In order to pass from our B 



B 



1p 



3B^- ( 2CA) 



A' 



iCl Me.) 



3B' 



20° 



to 



B, .„ we have calculated 



lb 



{CI Me.) 



dB 



i~ accordiu"- to the lormula (Ay en in 'S 4 tor the reduced value of 



dt ° n y 



1) Brinkman, Thesis for the doctorale, Amsterdam 1904. 

 ~) Recherches sur les gaz, p. 82. 



