Chapter 14, Problem 14.2P

Interpretation Introduction

Interpretation:

The dispersity of a sample of polystyrene has to be calculated.

Concept Introduction:

The ratio of number-average molar mass to weight-average molar mass is called the dispersity or polydispersity index.

    $\begin{array}{l}\text{Dispersity}\text{=}\frac{\overline{{\text{M}}_{\text{w}}}}{\overline{{\text{M}}_{\text{n}}}}\\ \\ \overline{{\text{M}}_{\text{n}}}\text{is}\text{number-average molar mass}\\ \\ \overline{{\text{M}}_{\text{w}}}\text{is weight-average molar mass}\end{array}$