314 



THE ATOMIC WEIGHTS. 



Seubert and Kobbe * determine the atomic weight by igniting rhodium 

 pentamine chloride in hydrogen, and weighing the residual metal. Their 

 results are given below : 



.0032 



In the sixth experiment the ammonium chloride formed was collected 

 in a bulb tube, and estimated by weighing as silver chloride. 3..5581 

 grms. of AgCl were obtained. 



Computing with N =13.935, ± .0021 ; CI =3.5.179, ± .0048, and AgCl = 

 142.287, ± .0037, we have— 



From per cent, of metal Rh = 102.215, ± .0143 



From AgCl ratio " = 102.287, ± .0324 



General mean Rh = 102.227, ± .0131 



If = 16, Rh = 103.006. 



In the second of these values the probable error given is only that due 

 to the antecedent atomic weights of N, CI, and AgCl. It is therefore 

 lower than it should be. The two values, however, are fairly in agree- 

 ment, and the result is satisfactory. 



* Ann. d. Chera., 260, 318. 1S90. 



