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.

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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