Some Basic Concepts of Chemistry

The treatment of an aqueous solution of 3.74g of Cu(NO3)2 with excess KI results in a brown solution along with the formation of a precipitate. Passing H2S through this brown solution gives another precipitate X. The amount of X (in g ) is
[Given : Atomic mass of H=1,N=14,O=16,S=32,K=39,Cu=63,I=127 ]