alleryWhich of the following concentration units of a solution is temperature-dependent?
AMolality
BMass percentage
CMolarity
DMole fraction
Answer & Solution
Correct answer: C. Molarity
1. Molality is moles of solute per kg of solvent — mass does not change with temperature.
2. Mass percentage is w/w — mass ratio, temperature independent.
3. Mole fraction is a ratio of moles — no volume, so temperature independent.
4. Molarity is moles per LITRE of solution; volume depends on temperature, so molarity varies with T.
_Source: syllabus Chemistry, Unit 1 "Solutions", §1.2_
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