1.34g of an organic compound (having some methoxy groups) with the molecular weight  134 gives 7.05 g of AgI precipitate in the Zeisel’s method of estimation of methoxy  groups. The weight percentage of methoxy group(s) in the organic compound is
(G.A.W. of Ag is 108g, I is 127g)    
 

Zeisel method: Organic compound is heated with excess HI, forming alcohol  and  $C{H}_{3}I.ROC{H}_3+HI\to ROH+C{H}_{3}I$. The iodomethane is distilled off and led into an  alcoholic solution of  $AgN{O}_3$, where it precipitates AgI
No. of moles of organic compound $=\frac{1.34}{134}=0.01mole$
No. of moles of AgI precipitated $=\frac{7.05}{235}=0.03$
 Number of methoxy groups per org.molecule = number of moles of AgI precipitated per  one mole of organic compound =3
W% of methoxy in the organic compound $=\frac{93}{134}\times 100=69.4$ .