702 



The specific heat of the two iodine atoms is 3 R, that of the 

 iodine molecule therefore 



li-]- R 



hv 



ohT 



\e^T_\) 



(12) 



The real specific heat of iodine at 300° C. is according to Streckkr 

 8.53 — 1.985 == 6.545. If this expression is substituted for (12), the 

 equation is satisfied for A — cir. 15^!. If we use this value for equa- 

 tion (8), we get in analogy with tables 1 and 2 : 



TABLE III. 



This value yields for the atomic distance: 



<^=:0.82 10-8 c,,n. 



If this value is compared with that for the mean molecule radius, 

 which has been determined in three ditfeient ways, it appears that 

 the value for the atomic distance as it is found above, is smaller 

 than the mean molecule radius. We must derive from this that 

 the atom centra in the iodine molecule lie closer together. Remark- 

 able is the agreement of the found r/-value with that of the atom 

 distances, w^hich were calculated by Mandersloot from the width 



TABLE IV. 



