An organic compound containing C, H,
O, and S is subjected to two analytical procedures. In the first
procedure a 9.33 mg sample is burned which gives 19.50 mg of C02
and 3.99 mg of H20. In the second procedure, a separate 11.05 mg
sample is fused (melted) with Na202 and the resulting sulfate is
precipitated as BaS04, which (when washed and dried) weighs 20.4
mg. (Appropriate amounts of Na202 and a compound containing barium
ion are added.) The amount...