200 mL of 2.5 M CaCl₂ is diluted to 400 mL. What is the final molarity?

A) 2.5 M

B) 5 M

C) 1.25 M

D) 0.625 M

Answer: C

Explanation: Dilution conserves the amount of dissolved solute, so C₁V₁ = C₂V₂. The final volume is twice 200 mL, so 2.5 M is halved to 1.25 M.

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