Question

$40\%$ by weight solution will contain how much mass of the solute in $1L$ solution, density of the solution is $1.2g/mL$ ?

• A. 480 g
• B. 48 g
• C. 38 g
• D. 380 g

Answer 1

Answer: (A)

Molarity $=\frac{\%\text{ by weight of solute }\times \text{ density of solution }\times 10(inlitre)}{\text{ molecular weight of the solute }}$
Molarity $=\frac{40\times 1.2\times 10}{M\times 1000}$
Again, since
Molarity $=\frac{\text{ weight of the solute }M}{\text{ volume of the solution (in litre) }}$
Therefore, weight of solute $=480g$