An aqueous solution of urea containing 18g urea in 1500 cm2 of the solution has a density of 1.052 .If the molecular weight of urea is 60 then the molality of solution
Answers
Answer:
Molality =
1.560
0.3
=0.192m
Explanation:
Density is the ratio of mass to volume.
Density is 1.052 g/ml.
1500 ml of solution corresponds to 1.052g/ml×1500ml=1578g
Molar mass of urea is 60 g/mol. Number of moles of urea is the ratio of mass to molar mass. It is
60g/mol
18g
=0.3mol
Molality of solution is the ratio of the number of moles of urea to the mass of solvent in kg.
Mass of water =1578g−18g=1560g=1.560kg (as 1 kg = 1000 g)
Molality =
1.560
0.3
=0.192m
Answer:
Molality =
1.560
0.3
=0.192m
Explanation:
Density is the ratio of mass to volume.
Density is 1.052 g/ml.
1500 ml of solution corresponds to 1.052g/ml×1500ml=1578g
Molar mass of urea is 60 g/mol. Number of moles of urea is the ratio of mass to molar mass. It is
60g/mol
18g
=0.3mol
Molality of solution is the ratio of the number of moles of urea to the mass of solvent in kg.
Mass of water =1578g−18g=1560g=1.560kg (as 1 kg = 1000 g)
Molality =
1.560
0.3
=0.192m