What is the mass of solute in 500 mL of 0.2 molar solution if molar mass is 40 g per mole?
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Answer and explanation
Correct answer: 4 g
First convert the solution volume: 500 mL = 0.5 L. Molarity gives moles through n = M × V, so n = 0.2 mol L−1 × 0.5 L = 0.1 mol. The solute mass is n × molar mass = 0.1 × 40 = 4 g. Therefore, option A is correct. Using 1 L would incorrectly give 8 g, and the other values do not follow the stated volume and molarity.
Frequently asked questions
What is the correct answer to this question?
4 g
Why is this the correct answer?
First convert the solution volume: 500 mL = 0.5 L. Molarity gives moles through n = M × V, so n = 0.2 mol L−1 × 0.5 L = 0.1 mol. The solute mass is n × molar mass = 0.1 × 40 = 4 g. Therefore, option A is correct. Using 1 L would incorrectly give 8 g, and the other values do not follow the stated volume and molarity.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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