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Answer: 1. Molarity

Key idea: a concentration term that uses volume changes with temperature, because volume changes.

Molarity = moles of solute per litre of solution. Volume expands on heating, so molarity changes. Mole fraction, weight percentage and molality use only masses or moles, which do not change with temperature.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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