Mn and Mw of a polymer are obtained by

GUJARAT SET 2024

The number average molar mass, M_n and weight average molar mass, M_w of a polymer are obtained respectively by:

• (A) Osmometry and Viscosity measurements
• (B) Osmometry and Light scattering measurements
• (C) Light scattering and Osmometry measurements
• (D) Light scattering and Sedimentation measurements

Correct Answer: (B) Osmometry and Light scattering measurements

Explanation:

Number average molar mass (M_n) is a colligative property typically measured via Osmometry. Weight average molar mass (M_w) depends on the size/mass of the particles and is determined via Light scattering measurements.