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The density of a solution prepared by dissolving 120g of urea (mol.mass =60u) in 1000th of water is 1.15g/ml. The molarity of the solution is
Molarity = Number of moles of solute/Volume of solution in LitresMoles of urea = Given mass/Molecular mass = 12060 = 2 molVolume of solution = Mass of solution/Density of solution= (120+1000) g/1.15 g.mL−1= 974 ml or 0.974 LHence, Molarity = 2 mol/0.974 L = 2.05 mol L−1
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