( 423 

 310" 



I Pressure 

 'iiiK^ ill iiiimitcrf i ill 



I in. in. IJo' 



1 V 



k =r — loq 



t '2P,-1\ 



Ü 



10 

 20 

 30 

 40 



805..-) 

 788.3 

 773.0 

 757.8 



742.8 



0.00189 

 0.00183 

 0.00182 

 0.00 1 84 



average 0.00184 



The activity of tlie catalyzer had, tliei'efore, undergone no change 



during these measurements, so that we were justified in cah'uiating 



the temperature-coetïicient from the results obtained. The result was 

 as follows : 



(J. Mechanism of the reaction. 



What idea are we to form al)0ut the meclianism of the reaction 

 if this takes a monomolecular course? 



If we assume the formation of Ni (CO)^ with an immeasurably 

 large velocity and the subsequent breaking up of this compound 

 according to the equation 



Ni (CO), = Ni + 2 CO, 4- 2 C 

 we must also acce{)t the equilibi-ium 



Ni (CO), f^ Ni -f 4 CO 

 of which the constant is given by the eipialioii : 



K= 



^N{(cn)^ 



This would then necessarily lead to the conclusitui, that the velocity 



