The molality of 5 molar urea solution having density 1.2 g/ml is
A
5 M
B
6.25 M
С
4.45 M
D
5.55 M
Answers
Answered by
6
Answer:
I think d 5.55
please mark me as drileant
Answered by
4
Answer:
The correct option is D. 5.55 M.
Concept:
Relation between molarity and molality is given by,
--------- (i)
Given:
Molarity of solution, M = 5 molar
M = 5 moles/1 L = 5 moles/1000 mL i.e., 5 moles are dissolved in 1000 mL of solvent.
Volume of solvent, = 1000 mL
As we know, Number of moles, n =
Molecular mass of urea, M = 60 g/mol
Hence, Mass of solute, m = n x M = 5 x 60 = 300 g
Density, d = 1.2 g/mL
According to the formula of density we have,
Now, using equation (i) we have,
Hence, the molality of the solution is 5.55 molal.
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