Question

4.5g of urea (molar mass = $60g mol^{-1}$) are dissolved in water and
solution is made to 100 ml in a volumetric flask. Calculate the molarity of
solution.

Answer 1

molarity = no. of moles / volume of solution in L
mole of urea = 4.5 / 60
volume of solution = 100/1000 = 0.1 L
molarity = 4.5/(60*0.1)
             = 3/4
             = 0.75 mole/L