Question

A solution contains 40 g of common salt in 320 g of water. What is the concentration in terms of mass by the mass percentage of the solution?

• A. 10.05%
• B. 11.05%
• C. 11.11%
• D. 11.15%

Answer 1

The correct option is C

11.11%

Explanation for the correct answer:-

Option (C) 11.11%

Step 1: Given data

Mass of solute (common salt) = 40g

Mass of solvent (water) = 320g

Step 2: Calculating mass percentage

The total mass of solution = mass of solvent + mass of solute

$\mathrm{Mass}\mathrm{of}\mathrm{solution}=320+40=360\mathrm{g}$

We know that,

$$\begin{gathered} \mathrm{Concentration}\mathrm{of}\mathrm{mass}=\frac{\mathrm{Mass}\mathrm{of}\mathrm{solute}}{\mathrm{Total}\mathrm{mass}\mathrm{of}\mathrm{solution}}\times 100 \\ \mathrm{Concentration}\mathrm{of}\mathrm{mass}=\frac{40}{360}\times 100 \\ \mathrm{Concentration}\mathrm{of}\mathrm{mass}=11.11\% \end{gathered}$$

Hence it is the correct option.

Therefore, option (C) 11.11% is the correct answer