If a 0.02 M solution has a volume of 1 L, how many moles of solute are present?
Answer and explanation
Correct answer: 0.02 mol
Molarity is defined as the number of moles of solute present in one litre of solution: M = n/V. Rearranging gives n = M × V. Substituting the given values, n = 0.02 mol L⁻¹ × 1 L = 0.02 mol. The litre units cancel, leaving moles. Therefore, option B is correct. Always ensure that volume is expressed in litres when using molarity.
Frequently asked questions
What is the correct answer to this question?
0.02 mol
Why is this the correct answer?
Molarity is defined as the number of moles of solute present in one litre of solution: M = n/V. Rearranging gives n = M × V. Substituting the given values, n = 0.02 mol L⁻¹ × 1 L = 0.02 mol. The litre units cancel, leaving moles. Therefore, option B is correct. Always ensure that volume is expressed in litres when using molarity.
Which subject and chapter does this question cover?
This is a Class 12 Chemistry question. Chapter: Chapter 01: Solutions. Topic: 2: Concentration Metrics.
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