Question

A solution contains 20 g of sodium chloride dissolved in 80 g of water. The concentration of this solution by mass percentage method is

• A. 10%
• B. 25%
• C. 80%
• D. 20%

Answer 1

The correct option is D 20%

Mass of solution = Mass of solute + Mass of solvent
= 20 + 80
= 100 g

Concentration (w/w)% of solution =Mass of solute/Mass of solution×100
=20100×100
= 20%
Hence, the correct answer is option (d).