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A chemist adds 425.0 mL of a 0.62 M barium chloride (BaCl2) solution to a reaction flask. Calculate the millimoles of barium chloride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

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Answer:

263,5 millimoles

Explanation:

Molarity (M) is an unit of concentration that refers the ratio between moles of solute and Liters of solvent in a solution. 0,62M means 0,62 moles of solute per liter of solution. Thus, moles of BaCl₂ are:

0,425L × (0,62mol / L) = 0,2635 mol of BaCl₂. In millimoles:

0,2632 mol × (1000mmoles / 1mol) = 263,5 millimoles

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