Question

13. Aqueous solution of urea is 15% by mass of
solution. Then the percentage of urea by mass of
solvent is
(1) 21.65%
(2) 17.64%
(3) 25.55%
(4) 15% Right option is(2) plzz explain how?​

Answer 1

Answer:

kindly consider the attachment

Answer 2

Dear Student,

◆ Answer -

(2) 17.64%

● Explanation -

Let x be the mass of solution.

Given that urea is 15 % by mass of solution.

Urea = 15% of x = 0.15 x

Solvent = x - 0.15x = 0.85 x

Mass percentage of urea w.r.t. solvent will be -

Mass percentage = mass of urea / mass of solvent × 100

Mass percentage = 0.15x / 0.85x × 100

Mass percentage = 17.64 % of solvent

Therefore, percentage of urea w.r.t. solvent is 17.64 %.

Hope this helps you.