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