1.5 moles of solute are present in 0.5 kg solvent. What is the molality?
Answer and explanation
Correct answer: 3 mole per kilogram
Molality is the amount of solute in moles divided by the mass of solvent in kilograms. Here, the solvent mass is already 0.5 kg, so no unit conversion is needed. Thus, m = 1.5 ÷ 0.5 = 3 mol kg⁻¹. Option B gives only the solute amount, option C multiplies instead of dividing, and option D reverses the division. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
3 mole per kilogram
Why is this the correct answer?
Molality is the amount of solute in moles divided by the mass of solvent in kilograms. Here, the solvent mass is already 0.5 kg, so no unit conversion is needed. Thus, m = 1.5 ÷ 0.5 = 3 mol kg⁻¹. Option B gives only the solute amount, option C multiplies instead of dividing, and option D reverses the division. Therefore, option A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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