If a 1L aq. solution of urea (d = 1.02 g/ml.) has
conc. 3M, then the molality of the solution will be
(1) 3.57 m
(2) 3 m
(3) 2.7 m
(4) 6 m
Answers
we have to find the molality of the solution, if 1 L aqueous solution of urea has concentration 3M.
solution : density of solution, d = 1.02 g/ml
volume of solution = 1000 ml
mass of solution = 1.02 g/ml × 1000 ml = 1020 g
concentration of solution = 3M
so no of moles of solute = 3 moles
mass of solute = no of moles × molar mass of solute (urea)
= 3 × 60 = 180g
so mass of solvent = mass of solution - mass of solute
= 1020g - 180g
= 840g
now molality = no of moles of solute/mass of solvent in kg
= 3/(840/1000)
= 300/84
= 3.57 m
Therefore molality of the solution will be 3.57 m.
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