(3b) A 1.25 g piece of copper metal is placed in 175 mL of a 0.236 M AgNOs solution. The balanced net ionic equation is 2Ag+ (aq) + Cu(s) â 2Ag(s) + Cu2+(aq) (i) What is the mass of silver metal produced in the reaction? (i) How many moles of the excess reagent remain when the reaction is complete?