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Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.

Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.

Molality = (w x 1000) / (mm x W)

Mass of solution = 2.5 kg = 2500 gms

0.25 mole of urea = 0.25 × 60 = 15g

Therefore mass of solvent = 2500 - 15

0.25 = (w x 1000) / (60 x 2485)

w = 37.25 gms

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