conversion mols to grams

I'm having trouble converting this!! Help!!

How many grams of NaCl do I need to make 500 mls of 0.5M NaCl solution?

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OK, a mole of NaCl would

OK, a mole of NaCl would weigh the total of the atomic weights of Na and Cl; you can get those figures from the periodic table and add them up. For a .5 M solution you would need half a mole of NaCl in 1 L of H2O; for 500 ml of solution, you would need half again. You do the math.

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