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0.5 mol of Na₂CO₃ is dissolved to make 0.75 L of solution. What is the molarity?

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A) 1.33333 M

B) 0.333333 M

C) 0.766667 M

D) 0.666667 M

Answer: D

Explanation: Molarity equals moles of solute divided by final solution volume in liters. 0.5 mol divided by 0.75 L gives 0.666667 mol/L.

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