A chemist wants a 0.100 M solution of NaOH. She has 0.0550 mol NaOH available. What volume of solution is needed to make the mixture?

Use molarity, M = moles ÷ volume, and rearrange to find volume: volume = moles ÷ molarity. Thus, 0.0550 mol ÷ 0.100 mol/L = 0.550 L. The volume needed is 0.550 L, choice C.

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