0.25 mole solute is present in 500 g solvent. What is the molality?
Answer and explanation
Correct answer: 0.5 mole per kilogram
The governing concept is molality, defined as moles of solute divided by the mass of solvent in kilograms. Convert 500 g of solvent to 0.500 kg, then calculate m = 0.25 mol ÷ 0.500 kg = 0.50 mol kg−1. Therefore, option A is correct. Options B, C, and D result from failing to convert the solvent mass correctly or from reversing the calculation.
Frequently asked questions
What is the correct answer to this question?
0.5 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. Convert 500 g of solvent to 0.500 kg, then calculate m = 0.25 mol ÷ 0.500 kg = 0.50 mol kg−1. Therefore, option A is correct. Options B, C, and D result from failing to convert the solvent mass correctly or from reversing the calculation.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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