500 mL of a solution contains 0.2 mol solute. What is the molarity?
Answer and explanation
Correct answer: 0.4 M
Molarity is the amount of solute in moles divided by the volume of the complete solution in litres: M = n/V. Convert 500 mL to 0.500 L, then calculate M = 0.2/0.500 = 0.40 mol L−1, or 0.4 M. Thus option C is correct. Option B ignores the volume conversion, while option D reverses the division and gives litres per mole rather than moles per litre.
Frequently asked questions
What is the correct answer to this question?
0.4 M
Why is this the correct answer?
Molarity is the amount of solute in moles divided by the volume of the complete solution in litres: M = n/V. Convert 500 mL to 0.500 L, then calculate M = 0.2/0.500 = 0.40 mol L−1, or 0.4 M. Thus option C is correct. Option B ignores the volume conversion, while option D reverses the division and gives litres per mole rather than moles per litre.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
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