How many mols Cl^- do you want? M x L = mols.
Since there are two Cl atoms in 1 molecule of CuCl2.5H2O, you need 1/2 that of CuCl2.5H2O.
Then mols = grams/molar mass. You know molar mass and you know mols, solve for grams.
How do you do this problem?
Calcuate the mass of CuCl2*5H2O required for preparing 400mL solution that of .25M in chloride ions.
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