S COPISAKOW, Carbon : its molecular structure, etc. 



These three stages can be conveniently represented 

 by the equation : — 



K= a\h\ c. 



Where K represents calories, a the heat of formation 

 of the complexes, b the heat of their disruption, c the heat 

 of oxidation of CO to CO.,. 



TIIIUD CLASS 



Fig. 6. 



It seems at first sight possible to use this formula as 

 a means of comparison and determination of the class to 

 which each form of carbon belongs, but, on more careful 

 consideration this fails, owing to the fact that each member 

 of the equation varies with the particular modification 

 and experimental conditions. 



Taking equal weights of amorphous carbon, graphite 

 and diamond, and subjecting them to complete com- 



