Practice question
Question
A solution is prepared by dissolving 20 g of a solute in water to make 400 mL of solution with a density of 1.25 g/mL. If the molarity is 0.5 M, what is the molar mass of the solute?
Explanation
Moles = M × V = 0.5 × 0.4 = 0.2 mol . Molar mass = (Mass/Moles) = (20/0.2) = 100 g/mol . (Density is extra info, not needed here.)
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