Question

Aq urea solution is 25 by mass of solvent . Its concentration by mass of solution

Answer 1

Answer:

In 100 gm of solution,

mass of urea = 25gm

mass of solvent (water) = 100- 25

=75 gm

mass% of solution = mass of solute ×100/ mass of solution

25×100/100

= 25%

Answer 2

Answer:

29.4%

Explanation:

In 100 gm of the solution,

mass of urea = 25gm

mass of solvent (water) = 100- 25

=75 gm

mass% of solution = mass of solute ×100/ mass of solution

25×100/100

= 25%

Mass of solute = 25 g

Mass of solvent = Urea ; Chemical formula. CO(NH 2) ; Molar mass, 60.0 g/mol

Mass of solution =25 + 60 = 85 g

Mass % of solution =Mass of solute×100/ Mass of solution

Mass % of solution = 25 X 100/ 85 = 2500/85 = 29.4 %

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