Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ?

Question

Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ? (A)  23.077 %  (B)  230.77 %  (C)  2.3077 %  (D)  0.23077 %

Tardigrade Admin · Accepted Answer

If H2O = x mol = 18 x g then urea = x mol = 60 x g Total mass of the solution = 18 x + 60 x = 78 x g Mass % of urea =(18x/78x) Ã 100 = 23 . 077 %

Q. Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ?

$23.077%$

$230.77%$

$2.3077%$

$0.23077%$

If $H_{2} O = x m o l = 18 x g$
then urea $= x m o l = 60 x g$
Total mass of the solution
$= 18 x + 60 x = 78 x g$
Mass $%$ of urea $= \frac{18 x}{78 x} \times 100 = 23.077%$

Q. Equal moles of water and urea are taken in a flask. What is mass percentage of urea in the solution ?

23.077%

230.77%

2.3077%

0.23077%

If H2​O=xmol=18xg then urea =xmol=60xg Total mass of the solution =18x+60x=78xg Mass % of urea =78x18x​×100=23.077%

$23.077%$

$230.77%$

$2.3077%$

$0.23077%$

If $H_{2} O = x m o l = 18 x g$
then urea $= x m o l = 60 x g$
Total mass of the solution
$= 18 x + 60 x = 78 x g$
Mass $%$ of urea $= \frac{18 x}{78 x} \times 100 = 23.077%$