ATOMIC WEIGHTS 453 



The lour series of analyses of the chloride combine a?; follows: 



Jorgensen 34.984, ± .007G 



Seubert and Kobbe 34.954, ± .0032 



Hiittlinger 34.956, ± .0020 



Dittmar 34.953, ± .0020 



General mean 34.955, ± .0013 



The work of Hiittlinger and Dittmar was done in the laboratory at 

 Erlangen, under the direction of Gutbier. So, too, was that of Kenz/ 

 who made similar analyses of rhodium pentamine bromide, Rhf^Hj^^Br,. 

 His data, with vacuum weights, are as follows : 



Bromide. Rh. Per cent. Rh. 



.87624 .21057 24.031 



1.56500 .37638 24.049 



2.04033 .49069 24.049 



2.00120 .48135 24.053 



1.89278 .45525 24.051 



2.30210 .55416 24.071 



1.02065 .24555 24.058 



1.31485 .31622 24.049 



1.8C060 .44766 24.059 



1.51040 .36339 24.059 



Mean, 24.053, ± .0022 



Hence Rh= 102.91. 



Ignoring the early work of Berzelius, and the single analysis by Jorgen- 

 sen of rhodium pentamine bromide, we have two ratios from wliicli to 

 compute the atomic weight of rhodium : 



(1). Rh(NH3)5Cl3:Rh: : 100: 34.955, ± .0013 

 (2). Rh(NH3)3r3:Rh: :100:24.053, ± .0022 



To reduce these we have — 



Hence, 



From ratio 2 Rh = 102.906, ± .0099 



" 1 102.934, ± .0044 



General mean, Rh = 102.929, ± .0040 



1 Inaug. Diss., Erlangen, 1909. 



