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Solutions - Intext Questions and Answer - class 12 chemistry


Solution of NCERT In Text Question-2.4

Question - 2.4 - Calculate the mass of urea (NH2 CONH 2) required in making 2.5 kg of 0.25 molal aqueous solution.

Solution: Given,

Molality (m) = 0.25 m

Molar mass (M B) of urea (NH2 CONH 2) = 14 + 2 + 12 + 16 + 14 + 2 = 60 g mol – 1

Mass of solvent (WA ) = 2.5 kg = 2500 gm

Mass of solute (W B) = ?

Now, we know that,

Solutions class 12 chemistry - NCERT In Text Solution19
Solutions class 12 chemistry - NCERT In Text Solution20

Thus, mass of given solute urea = 37.50 g