Q. 43.7( 118 Votes )

Calculate the mas

Answer :

Given,

molal solution is a solution that contains 1 molecular weight of solute in a kilogram of solvent.

2.5 kg of 0.25 molal aqueous solution.


Molar mass of urea (NH2CONH2) = (2 (1 × 14 + 2 × 1) + 1 × 12 + 1 × 16)


= 60 g/mol


1000 g of water contains 0.25 mol = (0.25 × 60) g of urea.


= 15 g of urea.


Means, 1015 g of solution contains 15 g of urea


Therefore,


2500 g of solution contains =


= 36.95 g


Hence, mass of urea required is 37 g (approx).

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