Question

An aqueous solution contains $30\%w/v$ of urea , density of solution is $1.2g/ml.$ Calculate mass of water in 100ml solution.

Answer 1

There is $30gm$ of urea present in aqueous solution in $100ml$ sol.

Therefore, height of this sol.$=$vol. of the sol.$\times$ density of sol.

$=100\times 1.2=120g$

Now mass of the solvent (Water) $=120-30=90g$