A chemist must prepare 550. mL of 1.00 M aqueous barium chloride (BaCl2) working solution. He'll do this by pouring out some 1.26 mol/L aqueous barium chloride stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the barium chloride stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
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