Question 23:
A solution contains 20 grams of salt dissolved in 80 grams of water. What is the concentration of the solution in terms of mass by mass percentage?
Options :
- a) 25%
- b) 30%
- c) 45%
- d) 20%
correct answer : d)
Explanation :
Mass of solute (salt) = 20 g.
Mass of solvent (water) = 80 g.
Total mass of solution = 20 + 80 = 100 g.
Mass percentage = (Mass of solute / Total mass of solution) × 100 = (20 / 100) × 100 = 20%.