0.25 mole of solute is dissolved in 250 g of solvent. What is the molality?
Answer and explanation
Correct answer: 1.0 mole per kilogram
The governing concept is molality, defined as moles of solute divided by the mass of solvent in kilograms: m = n(solute) / mass(solvent). Convert 250 g of solvent into 0.250 kg, then calculate m = 0.25 mol / 0.250 kg = 1.0 mol kg⁻¹. Therefore option A is correct. Option B forgets the gram-to-kilogram conversion, while C and D result from incorrect arithmetic. Solution volume is irrelevant to molality.
Frequently asked questions
What is the correct answer to this question?
1.0 mole per kilogram
Why is this the correct answer?
The governing concept is molality, defined as moles of solute divided by the mass of solvent in kilograms: m = n(solute) / mass(solvent). Convert 250 g of solvent into 0.250 kg, then calculate m = 0.25 mol / 0.250 kg = 1.0 mol kg⁻¹. Therefore option A is correct. Option B forgets the gram-to-kilogram conversion, while C and D result from incorrect arithmetic. Solution volume is irrelevant to molality.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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