CARBON. 79 



Filled with CO, it held the following weights, which give the accom- 

 panying densities : 



Wt. CO. Density. 



2.8470 -96705 



2.8468 .96698 



2.8469 .96702 



Mean, .96702, .000015 



Combining this density with Leduc's determination of the density of 

 hydrogen, 0.6948, .00006745, it gives for the atomic weight of carbon : 



.C =^.11.957, .0270. 



Leduc himself combines the data with the density of oxygen, taken as 

 1.10503, and finds = 11.913. In either case, however, the probable 

 error of the result is so high that it can carry little weight in the final 

 combination. 



For carbon, including all the foregoing series, we now have the sub- 

 joined ratios : 



(i.) Per cent. Ag in silver acetate 64.636, .0007 



(2.) " " tartrate.... 59.2806, =b .0014 



(3.) " " racemate.. 59.2769,1^.0012 



(4.) " malate .... 62.0016, ".0096 



(5.) " benzoate... 47.125, HT .0012 



(6.) Ag : CO 2 : : i.oo : 0.40723, .000071 

 (7.) C : O 2 : : i.oo : 2.6659, .0001 

 (8.) O : CO : : i.oo : 1.75029, .00005 

 (9.) Density of CO (air = i), 0.96702, d= .000015 



Now, computing with = 15.879, .0003, and Ag = 107.108, .0031, 

 we get nine values for the atomic weight of carbon, as follows : 



From (i) C= 11.921, .0012 



From (2) " 11.967, .0019 



From (3) "= 11.973, .0017- 



From (4) " = 11.972, .0098 



From (5) ..."== 11.917, .0008 



From (6) " = 11.860, .0077 



From (7) " 11.913, .0006 



From (8) " = 11.914, .0010 



From (9) " = 11.957, db .0270 



General mean C = 11.920, .0004 



If = 16, this becomes C = 12.011. 



