100 mL of 1 M ethanol is diluted to 200 mL. What is the final molarity?

A) 1 M

B) 0.5 M

C) 2 M

D) 0.25 M

Answer: B

Explanation: Dilution conserves the amount of dissolved solute, so C₁V₁ = C₂V₂. The final volume is twice 100 mL, so 1 M is halved to 0.5 M.

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