Which colligative property is most suitable for determining molar mass?
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Among all colligative properties,
\[
\boxed{\text{Osmotic pressure}}
\]
is preferred for determining the molar masses of proteins, polymers and other high molecular mass compounds because it can be measured accurately in dilute solutions.
Osmotic pressure is the most suitable colligative property for molar mass determination, especially for large molecules like polymers and biomolecules. It produces measurably large pressure values even in very dilute solutions and can be measured conveniently at room temperature, giving high sensitivity and accuracy.