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8. A 50.0 mL 0.05 mol/l solution of sodium cloride (NaCl) was mixed with 100.0 mL of 0.02 mol/l NaCl solution. What is the mass percent of NaCl in the final solution? Assume the volumes are additive and their densities z1 g/mL. The molar mass of NaCl is 58.5 g/mol. (10 points)