Question
Dissolving 120 g of urea (mol. wt. 60) in 1000 g 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
Read 2 Solution.
Mass of solute(Wa)=120 g
mass of solvent(Wb)=1000g
.'. mass of solution= 1120 g
density of solution = 1.15 g/ml
.'. Volume =1120/1.15
molecular mass of solute=60 g
Molarity = mass of solute multiply by 1000 and divide by molecular mass of solute and volume
By solving...
Molarity= 2.05 M
Best SolutionASHISH RANA 12 year ago
is this solution helpfull: 7 0
mass of solution=1000+120=1120
density=1.15
volume=1120/1.15
molerity= moles of solute/v in liter
hence=2.053
SAHIL KUMAR 12 year ago
is this solution helpfull: 7 0