Determine the molarity of a solution prepared by dissolving 16 .0 g urea (NH 2) 2CO in 38.6 g of water if the density of the solution is 1.30 g/mL? A. 1.38 M B. 0.57 M C. 18.9 M D. 6.38 M E. 4.51 M F. 0.0421 M G. 9.21 M

The answer to your question is M = 0.008

Explanation:

Data

Molarity = ?

mass of Urea = 16 g

density = 1.30 g/ml

Process

1.- Calculate the molar mass of Urea

molar mass = (12 x 1) + (4 x 1) + (14 x 2) + (16 x 1)

                   = 12 + 4 + 28 + 16

                   = 60 g

2.- Calculate the moles of urea

           60 g    1 mol

            16 g    x

            x = (16 x 1) / 60

            x = 16 / 60

            x = 0.27 moles

3.- Calculate the volume of solution

Volume = mass/density

Volume = 54.6/1.30

Volume = 34.125 ml

4.- Calculate molarity

Molarity = 0.27 / 34.125

Molarity = 0.008