What is the molar concentration (M) of a solution prepared by dissolving 20 g of NaOH in enough water to make 250 mL of solution?

Moles of NaOH = 20g / 40g/mol = 0.5 mol. Volume = 0.250 L. Molarity = 0.5 / 0.250 = 2.0 M.

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