Question

255 gm of an aqueous Solution contains 5 gm of urea. What is the concentration of the Solution in terms of molality. (Mol. wt. of urea = 60)

Answer 1

Mass of urea = 5 gm; Molecular mass of urea = 60 

Number of moles of urea = 5 / 60 = 0.083 

Mass of solvent = (255 – 5) = 250 gm