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In a 0.4 molal solution with water as solvent, how many moles of solute are present in 90 g water?
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Answer and explanation
Correct answer: 0.036 mol
Molality means moles of solute per kilogram of solvent. The water mass is 90 g = 0.090 kg. Thus solute moles = molality × solvent mass = 0.4 × 0.090 = 0.036 mol. No solution volume is needed, because molality is based on solvent mass rather than final solution volume.
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What is the correct answer to this question?
0.036 mol
Why is this the correct answer?
Molality means moles of solute per kilogram of solvent. The water mass is 90 g = 0.090 kg. Thus solute moles = molality × solvent mass = 0.4 × 0.090 = 0.036 mol. No solution volume is needed, because molality is based on solvent mass rather than final solution volume.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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