A 0.1052 g sample of copper metal is dissolved in 55 mL of concentrated HNO3 to form Cu2+ ions and then water is added to make a total volume of 208.5 mL. (Calculate the molarity of Cu2+.)

0.1052g*63.546/6.022e23 did I set it up right?

Yes, now divide by 0.2085 liters to get molarity.