Question

How many GRAMS of copper(2) iodide are present in 4.95 moles of this compound?

How many MOLES of copper(2) iodide are present in 4.73 grams of this compound?

Answer 1

To go from moles to grams you multiply by the molar mass. The molar mass of CuI2 is 317.355g/mol

4.95 moles CuI2 x (317.355 grams CuI2/1 mol CuI2) =1570 grams CuI2
*note moles CuI2 cancel!

To get from grams to moles you need to divide by the molar mass of the compound.

4.73 Grams CuI2 x (1 mol CuI2/317.355 grams CuI2) = 0.0150 Moles CuI2
*note grams CuI2 cancel.