A solution is prepared by placing 10.2 g of KCl in a 0.700 L volumetric flask and adding water to dissolve the?

A solution is prepared by placing 10.2 g of KCl in a 0.700 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 45.9 mL of the KCl solution react exactly with 39.0 mL of the AgNO3 solution?