All metal nitrates are soluble in water, how are you going to do that?
But just for a theoretical exercise:
2AgNO3(aq) + Cu^2+(aq) >>>> 2Ag+(aq) + Cu(NO3)2
2 moles of silver nitrate produce 1 mole of copper nitrate.
Therefore 3 moles would produce 3/2 moles of copper nitrate.
Step-by-step explanation: