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The mass percentage of chloride ion in a 21.00 mL m L sample of seawater was determined by titrating the sample with silver nitrate, precipitating silver chloride. It took 42.22 mL m L of 0.2992 M M silver nitrate solution to reach the equivalence point in the titration. What is the mass percentage of chloride ion in the seawater if its density is 1.025 g/mL g / m L ?