The keq of a reaction is 4 x 10-7. at equilibrium, the

The keq of a reaction is 4 x 10-7 at equilibrium, the reactants are favored.
if forward and backward rates balance in any reaction, then the reaction is at equilibrium.
k is the equilibrium constant and it shows the relationship between products and reactants at equilibrium.

if keq is smaller than 1, the reactants are more at equilibrium.

so here keq is less than 1, it means reactants will be favored.

Since there is the same amount of agn03 in both silver chloride and silver nitrate they produce the same amount of moles. therefore silver chloride produces the same amount of silver nitrate, so your answer is 15.0 moles of silver nitrate. i hope this !