p. C. WILHELMSEN, R. LUMRY AND H. EYRING 



87 



of slope —aH^/R. The value obtained from Fig. 6 for aH^ is about 

 3 kcal. Substituting of this value into equation 15 and assuming k is 

 equal to 1 yields an entropy of activation. The value obtained at 

 20.3° C is 38 e.u. The standard state used for calculating the entropy 

 in this case was 1 mole per liter. 



o 



3.10 



3.30 



I/Txl03 

 Fig. 6. 



Kinetics of Reaction Involving Oxygen as Oxidant 



Equipment 



The investigations of the kinetics of the reaction involving only 

 oxygen as the oxidant were made with the apparatus of Fig. 7. 



The reaction vessel 1 was a 3000-ml round bottom Hask with a 

 graduation at the 3000-ml mark. It was placed in heating jacket 2 so 

 that the temperature could be varied at will. The reaction vessel was 

 stirred with a magnetic stirrer, 3. The flask was fitted with two con- 

 nections, one of which was to the flask containing oxygen, 6, and the 

 other to a manometer, a dry ice trap, 7, and a vacuum pump. 



