# 10 g of a solute is dissolved in 90 g of solvent. If the density of solution is 2g/ml, find the weight-volume percentage.

Weight of the solute = 10 g
Weight of the solvent = 90 g
Density of the solution = 2 g/ml
The total weight of the solution = weight of the solute + weight of the solvent = 10 + 90 = 100 g
The volume of the solution = $\large\frac{\text{Mass of the solution}}{\text{density of the solution}}=\frac{100}{2}$$=50ml We know, weight – volume percentage =\large\frac{\text{Weight of solute}}{\text{Volume of solution}}$$\times 100$
By substituting the values, we get,
Weight – volume % =$\large\frac{10}{5}$$\times 100 = 20$
Therefore, the weight – volume % of the solution is equal to 20 g/ml.
Hence (A) is the correct answer.