How many grams of iodine do i need to react with 1 gram of copper?

my formula is 2CuI2 (2Copper Iodine2). I need to know how many grams of Iodine I would need to react with 1 gram of Copper. I think that one gram of copper equals .0157 mol Cu if that helps. I have no idea how to even start this problem so if you could show me how to do it step by step that would be cool. Thank you A LOT!