calculate the mass of urea required in making 2.5 kg of 0.25 molar aq solution.
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Mass of solution = 2.5 Kg.
Molality = 0.25 m.
Molar mass of urea (NH2CONH2) =14 + 2 × 1 + 12 + 16 + 14 + 2 × 1 = 60 g mol−1.
Let mass of urea (NH2CONH2) = w gram.
Number of moles of urea = w / 60 = 0.01667 mol.
Mass of urea in Kg = w/1000 = 0.001w kg.
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