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A chemist prepares a solution of barium chloride (BaCl2) by measuring out 1.3 x 102 umol of barium chloride into a 400. mL volumetric flask

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A chemist prepares a solution of barium chloride (BaCl2) by measuring out 1.3 x 102 umol of barium chloride into a 400. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's barium chloride solution. Round your answer to 2 significant digits. mmol L $

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