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Social Work homework help

Hello, I need help with the following chem question.  A 15.0 mL sample of NaCl solution has a mass of 15.78% g.  After the NaCl solution is evaporated to dryness, the dry salt residue has a mass of 3.26 g.  Calculate the following concentrations for the NaCl solution.1. % (m/m)2. % (m/v)3. molarity (M)

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