Question

Dissolving 120g of urea (mol.wt.60) in 1000g of water gave a solution of density 1.15 g/mL. The molarity of the solution is
A. 1.78 M
B. 2.00 M
C. 2.05 M
D. 2.22 M

Answer 1

Correct Answer - C
Mole `=(120)/(60)=2`
mass of solution = 1120 g
`V=(1120)/(1.15xx100)=(112)/(115)L`
`M=(2xx115)/(112)=2.05` mol/litre