You want how many mols? That's M x L = 0.5 x 0.250 = ?
Then grams NaCl = mols NaCl x molar mass NaCl.
The proper way to proceed is to weigh out the grams NaCl calculated above, transfer the solid quantitatively to a 250 mL volumetric flask, add some distilled or deionized water, swirl until the solid is dissolved, add water to the mark on the volumetric flask, stopper, mix thoroughly, label.
How to prepare 250 ml of 0.5M sodium chloride by dissolving solid salt NaCL?
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