182 



Albert P. Mathews 



Tables I and II bring out the relationship that M is some 

 function of the molecular weight and the number of valences 

 in the molecule, or M 2 K == / ,(Wt) (Valence) . The relationship 

 to molecular weight appears if we compare compounds of 

 the same valence number as shown in Table I. 



TABLE I 



It is clear from Table I that the factor M 2 K increases 

 steadily with the molecular weight. 



The importance of valence is shown in Table II. A heavier 

 compound, if it have fewer valences, may have a lower mass 

 of cohesion than a lighter substance. 



TABLE II 



1 The valence of the halogens in this and the next table is, for simplicity, 

 taken as unity. Their true valence is discussed farther on. 



