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A chemist prepares a solution of sodium carbonate (Na2CO3) by measuring out 12 . mol of sodium carbonate into a 50 , mL volumetric flask

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A chemist prepares a solution of sodium carbonate (Na2CO3) by measuring out 12 . mol of sodium carbonate into a 50 , mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's sodium carbonate solution. Round your answer to 2 significant digits

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