( 420 ) 



The deteriiiinatioii Avas niado al 3J0\ 



In f lie first experiment llie pressure of the CO was 786,8 mm. 

 H*i' at the commencement; after 30 minntes tlie pressui-e amounted 

 to 739,1) mm. Hp;. Tlie diminution of pressure in 30 minutes there- 

 fore amounted to 46,9 mm, Hg. 



dc 

 If we take for — the diminution of pressure per minute tlien 

 dt 



dc^ 



— becomes 1,56. 



dt 



In the second experiment the pressure of the CH) was 535,3 nun. 

 Hg at the commencement and after 30 minutes the |)ressure had 

 come down to 501,7 mm. Hg. Here, the diiuiuution of pressure 



in 30 minutes amounted, therefore, to 33,6 mm. Hj> or — = 1,12, 



dt 



Ci=:aver. of press, at beginn, andendat llie I'^f e\j)erim.=r763,35mui.IIg, 



Cj:^ If II If If If II ft II II 2'"' // =:: 518,5 ,/ ,/ 



If from this we calculate ;?, we find 



n = 0,86. 

 from which it is apparent that tlie reaction is a monomolecular one. 

 In order to make more cei'lain of this, the order of the reaction 

 was also determined at two otiiei- tonipci-aluros accoi'diiig to llie 

 method given bv Noyes. In tliis case // is calculated from the 

 following fornuda: 



n = 1-1 ^.— 



lo(f— 



in Avhich t^ and /, arc the times during which the same part of the 

 original quantity is converted when starting from (Hfierent concen- 

 trations i\ and L\. 



At 256° we obtained the following result: 



192 



loq 



, 525,1 



Loq 



•770,9 

 The experiment at 340° gaAC 



60 

 loil 58 



Ion 



■ 792,8 



