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A 2.050×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.4mL . The density of water at 20.0∘C is 0.9982 g/mL. Calculate the concentration of the salt solution in percent by mass

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