To make 2.5 kg of 0.25 molar aqueous solution, determine the mass of urea (NH2CONH2) that is required.

Urea’s molar mass (NH2CONH2) =

0.25 urea in a molar aqueous solution denotes:

of water contains of urea of urea i.e.,

( of solution contains of urea

Hence, of solution contains

Hence, total Urea needed is .