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The KEY DIFFERENCE between molarity (M) and molality (m) is that:
AMolarity uses kg of solvent; molality uses litre of solution
BMolarity uses moles of solvent; molality uses moles of solute
CMolarity is temperature-dependent; molality is temperature-INdependent
DMolarity is for liquids; molality is for gases
Answer & Solution
Correct answer: C. Molarity is temperature-dependent; molality is temperature-INdependent
Molarity (M) = moles solute per LITRE OF SOLUTION. Volume changes with temperature → molarity is T-dependent. Molality (m) = moles solute per KG OF SOLVENT. Mass is T-independent → molality is T-independent.
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