254 THE ATOMIC WEIGHTS. 



three ratios from which to compute the atomic weight of molybdenum, 

 viz: 



(l.) Percentage Mo in MoO,, 66.665, ± .0022. 

 (2.) 2AgCl : M0O3 : : loo : 50.202, ± .0018 

 {3.) 2NaCl : Ma.^MoO^ : 56.745, 4= .0017 : 100. 



These involve the following values : 



O ^ 15.879, ± .0003 AgCl = 142.287, ± .0037 



Na^ 22.881, zb .0046 NaCl = 58.060, ± .0017 



Hence for the atomic weight in question — 



From (i) Mo = 95.267, rb .0072 



From (2) " = 95.225, d= .0064 



From (3) " = 95.357, ± .0126 



General mean Mo = 95.259, i .0045 



With = 16, Mo = 95.985. 



This value is essentially that derived from Seubert and Pollard's data 

 alone. Keducing the latter to a vacuum would affect the result very 

 slightly — so slightly that the correction may be ignored. 



