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The method preferred for determining the molecular weight of a polymer is

1. osmotic pressure
2. gas density
3. lowering of freezing point
4. direct weighing of a single molecule

Correct answer: osmotic pressure

Solution

Osmotic pressure is preferred for polymers because it is sensitive to the number of dissolved polymer molecules, even when their masses are very large. Gas density and freezing-point depression are less suitable for high-molar-mass polymers, and direct weighing of a single molecule is not practical.

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