NITROGEN. 49 



atomic weight of potassium is only in part derived from 

 that salt. The following are the values which we shall 

 employ : 



Ag = 107.675, =b .0096 ^ 



K =- 39.019, ± .012 



Na = 22.998, ± .oil 



CI = 35-370, ± .014 



O3 = 47-8899, ± .0105 



AgCl = 143.045, zb -0108 



NaCl = 58.3676, ± .0052 



Now, from ratio number five we can get the molecular 

 weight of ammonium chloride, NH^Cl = 53.4048, ± .0048, 

 and N = 14.0336, ± .0153. 



From ratio number four an independent value for nitro- 

 gen can be calculated, namely, N = 14.0330, =h .015. 



For the molecular weight of silver nitrate three values 

 are deducible, namely : 



From (i) AgNUj = 169.5655, ± .0151 



From (2) " = 169.5362, ±z .0138 



From (3) " ^= 169.5612, zb .0429 



General mean _ " ^ 169.5489, =b .0099 



Hence N = 13.9840, ± .0174. 



The molecular weight of potassium nitrate is twice cal- 

 culable, as follows : 



From (6) KNO3 = 100.8985, rb .0255 



From (7) " =r 100.8801, i .0178 



General mean__ " = 100.8863, ± .0146 



And N = 13.9774, ±: .0216. 



So also for sodium nitrate we have : 



From (8) NaNOg = 84.8773, ± .0076 



From (9) " =84.8809,^.0099 



General mean.. " =: 84.8785, d= .0060 



And N = 13.9906, ± .0163. 



We have now before us six estimates of the atomic weight 

 of nitrogen. It only remains for us to combine these after 

 .4 



