20 AET. 10. K. TKEDA I STUDIES ON THE 



Ö'i _ ^2 _ 



= 10.9 nearly, 



while under a pressure of 200 m.m. mercury the following values 

 have been found : 



Substance. Ellier. lodobenzeno. Benzene. Carbon tctraclilori<1e. 



-„^=- 12.9 12.G la.-'j 12.7 



li 1 



The values of q have been calculated by means of the Clapeyeon- 

 Clausius equation from the vapour pressures determined by 

 Ramsay and Young. 



As -^fr, prji , are equal, ^i, an, must also be 



equal, the numerical value depending on the unit of pressure 

 employed. Hence if we put 



^1 _ Q2 



= h 



R'i\ in\ 



then «1 = a. = = h + ln SÇ-. 



The equations {A) then become 



in which T^, T^, are the only constants characteristic of 



the components. The equation (10) now reduces to 





C^e ^ 'r^ + C.e^ ^^+ =1 (11) 



When Ci, Co, are given, the boiling point T of the solution 



can be calculated by this equation. But it is only for a binary 



