20 g solute is dissolved in 180 g water. What are the mass percentages of solute and solvent respectively?
Answer and explanation
Correct answer: 10 percent and 90 percent
Mass percentage is the component mass divided by total solution mass, multiplied by 100. Total mass = 20 + 180 = 200 g. Solute percentage = (20/200) × 100 = 10%, and solvent percentage = (180/200) × 100 = 90%. Hence option A is correct. The percentages add to 100%, confirming that the total solution mass is the proper denominator.
Frequently asked questions
What is the correct answer to this question?
10 percent and 90 percent
Why is this the correct answer?
Mass percentage is the component mass divided by total solution mass, multiplied by 100. Total mass = 20 + 180 = 200 g. Solute percentage = (20/200) × 100 = 10%, and solvent percentage = (180/200) × 100 = 90%. Hence option A is correct. The percentages add to 100%, confirming that the total solution mass is the proper denominator.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Percentage composition and empirical/molecular formulas.
