A sample of polymer has M_n = 5.0x10^4 g mol^-1 and M_w = 8.0x10^4 g mol^-1. Its polydispersity index M_w/M_n is

JEE Main levelSingle correct optionDifficulty 2 of 3pl006

A sample of polymer has $M_{n} = 5.0 \times 1 0^{4} g mo l^{- 1}$ and $M_{w} = 8.0 \times 1 0^{4} g mo l^{- 1}$ . Its polydispersity index $M_{w} / M_{n}$ is

PDI

= M_{w} / M_{n} = 8.0 \times 1 0^{4} /5.0 \times 1 0^{4} = 1.6

. The inverted ratio would be below 1, which is impossible as

M_{w} \geq M_{n}