Question

the density of solution prepared by dissolving 120g of urea in 1000g of water is 1.15g/mL. The molarity of this solution is??? ​

Answer 1

Morality= moles of solute/volume of solution so, the mass of urea whose molecular weight is 60 is 120g. Therefore it is 2 moles of solute
Density of solution is 1.15g/ml
Mass of solution is mass of solute +mass of solvent
Therefore, it is 120+1000 =1120g.
Volume of solution is mass/density.
Therefore it is 1120/1.15 which is equal to 974 approx.
It litres the volume is 0.974 litres
Therefore molarity will be moles of solute/volume of solution
Therefore it is 2/0.974 which is nearly equal to 2.05 Molar or mol/l
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