Q. Number average molecular mass, $\overline{M_{n}}$ and weight average molecular mass $\left( {\overline{M_{\ }}}_{w} \right)\$of synthetic polymers are related as
A) ${\overline{M}}_{n} = \left( \overline{M_{w}} \right)^{1/2}$
B) ${\overline{M}}_{n} = {\overline{M}}_{w}$
C) ${\overline{M}}_{w} > {\overline{M}}_{n}$
D) ${\overline{M}}_{w} < {\overline{M}}_{n}$
Explanation
(c)
$PDI = \frac{{\overline{M}}_{w}}{{\overline{M}}_{n}}$
For synthetic polymer, PDI>1
$\therefore\ {\overline{M}}_{w} > {\overline{M}}_{n}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.