For the following reaction, the equilibrium constant Kc at 298 K is 1.6×1017Fe+2aq+S2−aq⇌  FeSsWhen equal volumes of 0.06 M Fe+2 (aqs) and 0.2M S2-(aqs) solutions are mixed, the equilibrium concentration of Fe+2 (aq) is found to be Y×10−17M. The value of Y is___