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Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.

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By Expert Faculty of Sri Chaitanya
a
37 g
b
35 g
c
34 g
d
32 g

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detailed solution

Correct option is A

Mass of solvent = 1000 g Molar mass of urea (NH2CONH2) = 60 g mol-10.25 mole of urea = 0.25 x 60 = 15 gTotal mass of solution = (1000 + 15) g = 1.015 kg∵1.015 kg of solution contain urea = 15 g∴2.5kg of solution will contain urea =151.015×2.5=37 g

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Similar Questions

Match the items of Column I with Column II.

 Column I (Concentrations term) Column II (Factor on concentration term depends)
A.Molarityp.Dependent upon temperature
B.Molalityq.Not depend upon volume
C.Mass per centr.Depend upon volume of solution
D.Volume per cents.Depend upon moles of solute

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