top of page

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

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

Molality = (w x 1000) / (mm x W)

Mass of solution = 2.5 kg = 2500 gms

0.25 mole of urea = 0.25 × 60 = 15g

Therefore mass of solvent = 2500 - 15

0.25 = (w x 1000) / (60 x 2485)

w = 37.25 gms

17 views0 comments

Recent Posts

See All
bottom of page