(;()2 



It is therefore self-evident tiiat when the quantities s= RTjc-.p^Vk 

 and Tk-.pjc are calculated, whicli occur in van dek Waals's consi- 

 deralions, no linear dependence on 2: (1 4-/^)^ I'esp. 1 -\~ x is to be 

 expected there either. 



3. Now 



RTj, 8 



X 



Pkf-^k 3 l+<5 7/i^(4n — 3m) 

 is found for the quantity ^, passing (with Ab = 0) into 



X 



(7) 



(7a) 



3 \-]-^r\i-'/jy{i+^-^ir+'l,n 



For ^ = 1 (all simple molecules) s becomes =.s'„ = Vg (or:=r3,77, 

 when b varies with v), and for /? = (all double molecules) .§ becomes 

 = 73 X 2, hence twice the value. But here too we remain very 

 far from linear dependence. 



For ^ = Vs we find namely for the last factor in (7^) the value 

 384:475 = 0.808; for 1^='/, the value 280 : 360 = 0,803 ; and 

 for ^=73 the value 375:448 = 0,837. Hence a dilFerence of about 

 20V« for /?=\/,. 



On account of the importance of the accurate knowledge of the 

 value of the quantity .s^ for associating substances, I have calculated 

 the following table. 



