Calculate the molal concentration.
A 1% (w/w) solution of cocaine hydrochloride ( molar mass 339.81 g/mol) in water.
1% w/w = 1 g coke/100 mL solution = 1 g coke/(1 g coke + 99 g H2O).
Now if you knew the density you could go further but I don't see a density listed.
If you wish to assume the density of the solution is 1.0 g/mL (and it should be close to that since this is such a dilute solution), then mols coke = grams coke/molar mass coke. That will be mols/100 mL solution (with a density of 1. g/mL) so convert that to mols/L and that will be M.