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The following reaction was studied in an experiment: Ag+(aq) + Cl−(aq) → AgCl(s), and the data are listed below. Calculate the average rate of the reaction for the time interval 120s to 180s.

The following reaction was studied in an experiment: Ag⁺(aq) + Cl⁻(aq) → AgCl(s), and the data are listed below. Calculate the average rate of the reaction for the time interval 120s to 180s.