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Practice question

MCQ

Question

A solution contains 30 g of a solute in 120 g of water. If the mass percentage of the solute is increased to 25% by evaporating water, what mass of water remains?

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Explanation

Initial mass % = (30/30 + 120) × 100 = 20% . New mass % = 25% = (30/30 + w) × 100 . 0.25 (30 + w) = 30 , 30 + w = 120 , w = 90 g .

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