0.2 M dm3 is not correct. You must mean 0.2 M which means 0.2 mol/dm3.
And you must want g/dm3.
grams Cl^- = mols Cl^- x atomic mass Cl^- = 0.2 x appox 35.5 = ?
Calculate the mass concentrated in gdm3 of the ion Cl- in 0.2M dm3 sodium chloride solution.?
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