How many moles of solute are present in 400 mL of 0.25 M solution?
Answer and explanation
Correct answer: 0.10 mol
Molarity is moles of solute per litre of solution, so use n = M × V with volume in litres. Convert 400 mL to 0.400 L. Then n = 0.25 mol L⁻¹ × 0.400 L = 0.100 mol. Thus option B is correct. The value 0.25 ignores the volume, while using 400 without conversion would create a factor-of-1000 error.
Frequently asked questions
What is the correct answer to this question?
0.10 mol
Why is this the correct answer?
Molarity is moles of solute per litre of solution, so use n = M × V with volume in litres. Convert 400 mL to 0.400 L. Then n = 0.25 mol L⁻¹ × 0.400 L = 0.100 mol. Thus option B is correct. The value 0.25 ignores the volume, while using 400 without conversion would create a factor-of-1000 error.
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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