The treatment of an aqueous solution of 1.87g of $Cu{\left(N{O}_3\right)}_2$ with excess KI results in a brown 
solution along with the formation of a precipitate.$H_{2}S$ Passing 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]