What will be the mass percentage of resulting solution prepared by mixing 15% (w/w) 500g aqueous solution of urea with 25% (w/w)400g aqueous solution of it :-

Options

A. 0.18
B. 0.2
C. 0.25
D. 0.15

Answer

B

Explanation

Amount of urea `= (15)/(100)xx500+(25)/(100)xx400`
`=75+100=175g`
`%w//w=(175)/(900)xx100=19.44%`