Question

A solution contains 10 g of a solute in 100 g of the solvent. Its concentration in terms of mass percentage is:

• A. 9.9
• B. 9.1
• C. 11.1
• D. 91

Answer 1

The correct option is B 9.1

Mass of solute $=10g$

Mass of solution $=Massofsolute+Massofsolvent$

$=10g+100g$

$=110g$

Mass % $=\frac{\text{Mass of solute}\times 100}{\text{Mass of solution}}=\frac{10\times 100}{110}=9.09=9.1\%$