Which group contains only concentration units that are not directly affected by temperature change?
Answer and explanation
Correct answer: Molality and mole fraction
Molality uses moles of solute per kilogram of solvent, and mole fraction uses a ratio of moles. Neither definition contains volume, so these quantities do not directly change when thermal expansion changes the solution volume. Molarity, volume percent and mass-volume percent involve volume and can therefore vary with temperature.
Frequently asked questions
What is the correct answer to this question?
Molality and mole fraction
Why is this the correct answer?
Molality uses moles of solute per kilogram of solvent, and mole fraction uses a ratio of moles. Neither definition contains volume, so these quantities do not directly change when thermal expansion changes the solution volume. Molarity, volume percent and mass-volume percent involve volume and can therefore vary with temperature.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
